Chemistry MCQs (Multiple-Choice Questions)

1: A sample of 502 has volume 2.45 L at a pressure of 4.6 x103 Pa. What he new volume of the gas, if the pressure is changed to 1.4 x104 Pa and the temperature is kept constant?

A. 0.81 L

B. 0.57 L

C. 1.12 L

D. 1.34 L

2: At 298 K and 1 atmospheric pressure, a given mass of gas occupies the 30 mL volume. If the pressure is increased to 1.50 atmosphere and the temperature is kept constant. then what is the volume of the gas?

A. 25 mL

B. 18 mL

C. 24 mL

D. 20 mL

3: If the volume of a sample of a gas at 15°C and 1 aim is 3.12 L. then what is the volume of this gas at 42"C and 1 atm?

A. 3.15 L

B. 2.82 L

C. 3.41 L

D. 2.12 L

4: If the partial pressure of oxygen in air is 184 torr and the total atmospheric pressure is 782 torr, then what is the mole fraction of 02 present?

A. 0.413

B. 1.217

C. 1.387

D. 0.235

5: Which of the following options is the correct bond length of CC (Alkanes) bond?

A. 1.00 A

B. 0.68 A

C. 1.54 A

D. 1.76 A

6: Which of the following options is the correct bond energy of C—Br bond?

A. 55.0 Kcallmole

B. 69.0 Kcallmole

C. 74.0 Kcallmole

D. 81.0 Kcallmole

7: What is the correct atomic radii (pm) of hydrogen (H)?

A. 8

B. 12

C. 24

D. 32

8: A solution is prepared by dissolving 11.5 g of solid NaOH in enough water for making 1.40 L of the solution. What is the molarity of this solution?

A. 0.112 M NaOH

B. 0-243 M NaOH

C. 0.206 M NaOH

D. 0.184 M NaOH

9: How many protons are dissociated by polyprotic acids at a time?

A. One

B. Two

C. Three

D. Four

10: Which of the following options is the correct Ka value of the oxyacid HCIO2?

A. 1.2 )(10-2

B. 3.5 x10-8

C. 2.4 x 10-4

D. 5.1 :«10-3

11: What is the correct value of the pH of 1.0 X 10‘10 M HCl?

A. 1.00

B. 5.00

C. 7.00

D. 9.00

12:

It is given that:

TC = 190.55 K

pC = 4.604 MPa

VC = 99 cm3 mol

A.

360 kg m‘3

B.

227 kg m'3

C.

440 kg m'3

D.

400 kg m‘3

13: Which of the following options is the correct value of the molecular mass of hydrated copper sulphate (CuSoa . SHZO)?

A. 240

B. 245

C. 250

D. 255

14:

Complete the given chemical reaction.

2BaS + 2H20 »

A.

2BaO + 2H2S

B.

Ba(SH)2 + Ba(OH)2

C.

Ba2O + 2H2S

D.

8as2 + BaOH + H20

15:

Complete the given chemical reaction.

Fe3O4 + 8HC| » 7?

A.

2FeCI3 + FeCl2 + 4H20

B.

3Fec12 + 4H20 + Cl2

C.

2FeCI + 2FeCI2 + 4H20 + c12

D.

2FeCl3 + FeCl2 + 4H20

16: On heating 0.197 gm of an organic substance with excess of strong nitric acid and silver nitrate gives 3.525 gm of silver iodide. What will be the percentage of iodine in this compound?

A. 43.71%

B. 51.84%

C. 36.68%

D. 31.53%

17: In relation to the oxidation-reduction process, which of the following statements is NOT correct about an oxidized element?

A. It loses electrons.

B. Its oxidization state decreases.

C. It acts as reducing agent.

18: Which of the following chemical reactions takes place between silver nitrate and the solution of neutral tartrate?

A. C4H4O6 + 2AQ’ " A92C4H406

B. C4H4O6 + 2Ag+ » AgC4H4O4 + 2A902

C. C4H406 + 2Ag+ -> 2AgO + c.11404

D. C4H406 + 2Ag+ -» A92C2H402 +2co2

19: While dissolving 0.3 mol NH3 (g) in 54.045 9 H20 (l) at 25°C and pressure 101.325 kPa, it was found that a heat of 6870 J passed to the surroundings. Calculate the correct value of me].

A. 8

B. 10

C. 12

D. 15

20: With regard to the radioactive processes, what is the effect of positron production on neutron/proton ratio?

A. The neutron/proton ratio increases.

B. The neutron/proton ratio decreases.

C. It does not affect the neutron/proton ratio.

21: If k is the rate constant, T is the absolute temperature in kelvin, A is the pre—exponential factor, E0 is the activation energy and R is the universal gas constant, then which of the following options is correct according to Arrhenius' equation?

A. k = Ae‘Ea’an

B. k= AEaeR/T

C. kEa: eN(RT)

D. kEa ___ eART

22: Which of the following options dissolved in chloroform is used as a nitrating agent in the organic synthesis?

A. N2O5

B. NCL3

C. N2O4

D. NF3

23: What is the life of the uranium nuclide in the decay of Uranium — 234 (atomic number — 92) which decays to Thorium ~230 (atomic number — 90) and produces an a particle?

A. 2.48 x105 years

B. 8 x104 years

C. 4.51 x109 years

D. 3.28 days

E. 24.1 days

24: It is given that the mass of an article is 150 Q. What is the mass of the article in ounces?

A. 6.74 oz

B. 3.17oz

C. 5.29 oz

D. 7.16 oz

25: In relation to acid-base properties of salts, which of the following options results in the production of basic solutions?

A. Cations of strong bases and anions of strong acids.

B. Cations of weak bases and anions of strong acids.

C. Cations of strong bases and anions of weak acids.

D. Cations of weak bases and anions of weak acids.

26: During which of the following types of chemical reactions, an insoluble substance, such as a solid is formed and is separated from the solution on mixing of the two solutions?

A. Acid-base reactions

B. Oxidation-reduction reactions

C. Precipitation reactions

D. None of the above.

27: lfV is the volume of gas, n is the number of moles of gas particles and a is a proportionality constant, then which of the following options correctly states the Avogadro's law?

A. a/V = n

B. V = an

C. n = aV

D. Vn = a

28: Which of the following laws of chemistry states that the partial vapor pressure of each component of an ideal mixture of liquids is equal to the pure component's vapor pressure multiplied with its mole fraction?

A. Newlands' law of octaves

B. Law of mass action

C. Raoult's law

D. Periodic law

29: In relation to the ion-selective electrodes, which of the following options is used as a reference solution?

A. Dilute hydrochloric acid

B. Dilute sulphuric acid

C. Dilute carbonic acid

D. Dilute acetic acid

30: Which of the following chemical equations correctly represents the reaction that takes place when phosphonium iodide is heated at 60°C?

A. PH4I—PH2» PHZ + H2!

B. 2PH4I > 2PH3 + H2I2

C. PH4I .. PH3 + Hi

D. 2PH4I» P2H6 + 2Hl

31: What is the standard reduction potential for the given reaction at 25°C? H202 (aq) + 2H1”) + 2e’-> 2H20 (I)

A. +1.23 E° / v

B. +2.87 E° / v

C. +0.45 E° [V

D. +1.77 E° /v

32: Which of the following chemical reactions correctly illustrates the heating of iron disulphate (FeSQ) at 600°C in a vacuum?

A. Fes2 4 Fe + 52

B. 2Fes2 4 FeZS + s

C. Fes2 4 FeS + s

D. 2Fes2 4 Fe2S4

33: In relation to the base strength in aqueous solutions, which of the following options has the highest base strength?

A. CN'

B. H20

C. OH’

34: Complete the given chemical reaction. Cuso4 + 2Kl 4

A. CuK2 + I2SO4..

B. Col2 + K2SO4

C. CuKzlz + SO2 + 02

D. Cul202 + 2KSO2

35: For the production of10.5 g of silver metal. how long must a current of 6.5 A should be applied to the Ag' solution?

A. 26.8 min

B. 24.1 min

C. 31.2 min

D. 22.7 min

36:

Which of the following lithium compounds has the given characteristics?

- It decomposes at 380°C.

- It reacts water.

- It consists of white orthorhombic crystals.

A.

Lithium amide

B.

Lithium borohydride

C.

Lithium bromide

D.

Lithium carbonate

37: The stirring rod is made of which of the following material?

A. Metal

B. Wood

C. Glass

D. Plastic

38: Which of the following options is the correct wavelength range of infrared radiations?

A. 3 x10“2 to 7 x10'5 cm

B. 1.8 x10'3 to 6 x10'6 cm

C. 4 x10‘2 to 8 x10'7 cm

D. 2x10-2to 9x104 cm

39: What is the percent dissociation of an acetic acid (KB =18 x10‘5) in 0.100 M HC2H3O2 solution?

A. 0.8%

B. 1.3%

C. 1.6%

D. 2%

40: In relation to corrosion, which of the following chemical reaction equations is correct?

A. 2Fe2+ (aq) +02 (9) + (4 + 2n)H20 (I) 4 F9203 . nHZO (s) + 4H+ (aq)

B. 4Fe2+ (aq) +02 (9) + (4 + 2n)H20 (1)» 2Fe203 . nHQO (s) + 8H+ (aq)

C. 4Fe2+ (aq) +02 (9) + (4 + 2n)l-I20 (l) -* 2Fe20 . nH20 (s) + 8H+ (aq) + 2FeO (aq)

D. 2Fe2+ (aq) +02 (9) + (4 + 2n)H20 (I) + 2Fe03 . nl-IZO (s) + 4H° (aq)

41:

In relation to ammonium chloride, complete the given chemical reaction.

2NH4C| + CuC12 -v

A.

2NH4 + CuCI4

B.

Nzl-l4 + 2I-ICI +CuCl4

C.

(NH4)2 + CuCl4

D.

2NH4 + Cl2 + CuCl2

42: Which of the following laws of chemistry states that the mole fraction of a gas dissolved in a solvent is directly proportional to the partial pressure of the gas?

A. Raoult's Law

B. Henry's law

C. Lavoisier-Laplace law

D. Hess law

43: If the half-life of molybdenum-99 is 67.0 h, then how much of a 1.000-mg sample of Mo (atomic weight = 99 and atomic number = 42) is left after 335 h?

A. 0.18 mg

B. 0.081 mg

C. 0.32 mg

D. 0.031 mg

44: What is the correct molecular formula of an organic compound that has the molecular weight of 90 and the empirical formula CHZO? It is given that, C =12, H =1, and 0 =16.

A. C6H12O6

B. C3H6O3

C. CzH4O6

D. C2H8O4

45: At a temperature of100°C and at a pressure of 27.6 MP8, the volume Occupied by two moles of carbon dioxide is 140.06 cm3. What will be the compressibility factor?

A. 0.7821

B. 0.6230

C. 0.8442

D. 0.6588

46: What is the correct elemental composition of Chromium Chloride?

A. Cr is 32.84%, Cl is 67.16%

B. Cr is 38.62%, Cl is 61.38%

C. Cr is 27.22%. Cl is 72.78%

D. Cr is 45.35%, CI is 54.68%

47: Which of the following statements is not correct about heat?

A. In an endothermic process, energy as heat flows into a system.

B. The f‌low of energy is due to a temperature difference.

C. It is a state function.

D. In an exothermic process. energy as heat flows out of a system.

48: Which of the following statements is not correct about the kinetic molecular theory of gases?

A. The volume of gas particles is zero.

B. The average kinetic energy of the particles of gas is inversely proportional to the gas temperature (temperature in kelvins).

C. There is no interaction among the gas particles.

D. The gas particles are in constant motion which collide with the container walls and produces pressure.

49: Which of the following laws of chemistry states that the molar volume of different gases at the same temperature and pressure has the same value?

A. Gay-Lussac’s law

B. Boyle's law

C. Avogadro’s law

D. None of the above.

50: In relation to Charles' law, what is the effect of decreasing the absolute temperature of the gas on its volume?

A. The volume will decrease.

B. The volume will increase.

C. It will have no effect on the volume.

51: Which of the following options is the correct Lewis structure of the nitrogen molecule (N2)?

A. :N:::N:

B. ::N::N::

C. :N::N:

D. :N:N:

52: Which of the following types of molecules shows an inductive effect?

A. Molecules containing single bond.

B. Molecules containing double bond.

C. Molecules containing triple bond.

D. Both options b and c.

53:

Which of the given chemical reactions correctly illustrates the synthesis of Americium (z = 95)?

A.

Option i)

B.

Option ii)

C.

Option iii)

D.

None of the above.

54: A gas is expanded from 36 L to 59 L at a constant external pressure of17 atm. What is the work associated with the expansion?

A. -391 L.atm

B. -383 L.atm

C. -310 Latm

D. -322 Latm

55: What is the normal boiling temperature of ethanol?

A. 396.49 K

B. 302.72 K

C. 320.15 K

D. 351.44 K

56: What is the correct boiling point of pure nitric acid (HNO3)?

A. 72°C

B. 86°C

C. 93°C

D. 107°C

57: In relation to analytical chemistry, which of the following types of metals are present in the second group of metals?

A. Metals whose chlorides are insoluble/diff‌icultly soluble and whose sulf‌ides are insoluble in dilute Acids.

B. Metals whose sulfides are soluble and whose chlorides are insoluble in dilute acids.

C. Metals whose chlorides are soluble but whose sulf‌ides are insoluble in dilute acids.

D. Metals whose chlorides as well as sulf‌ides are soluble in dilute acids.

58:

Which of the given apparatuses should not be heated?

A.

Only option i).

B.

Only option ii).

C.

Only option iii).

D.

Both options ii) and iii).

E.

All of these apparatuses can be heated.

59:

Name the apparatus displayed in the given image.

A.

Erlenmeyer flask

B.

Volumetric flask

C.

Florence flask

D.

Beaker

60:

What is the balanced chemical equation for the process in which an a particle is produced by Np (atomic number: 93 and atomic mass 237)?

A.

Option 1)

B.

Option ii)

C.

Option iii)

D.

Option iv)

61: Consider a system undergoing an endothermic process in which 18.2 kJ of heat flows and where 1.6 kJ of work is done on the system. What is the value of AE for this system?

A. 16.6

B. 19.8

C. 11.4

D. 14.2

62:

What is the AH for the given chemical reaction?

H2 O(I) "H2O (g)

A.

20 KJ

B.

12 KJ

C.

44 KJ

D.

52 KJ

63:

Complete the following reaction.

HCIO4 + K+ » ?

A.

CIO2 + KHO2

B.

H‘ + KCI + 202

C.

H+ + KCIO4

D.

KHo2 + CIO2

64: Which of the following options is the correct formula equation for the chemical reaction where aqueous potassium hydroxide is mixed with aqueous iron(lll) nitrate?

A. 3K0HlaCII 1‘ 11901093180 'r FeKalS) 1* H200) + 3N02(g) + H+(ll + 02(9)

B. 3KOH(aq) + Fe(N03)3(aq) » Fe(OH)3(s) + 3KN03(aq)

C. 3K0HlaCl) + FG(N03)318ql '° F910HI315) + Nozlg) + KstoolaCl)

D. 3KOH(aq) + Fe(N03)3(aq) 4Fe03(s) + 3KN03(aq) + 3H*(aq)

65: At 25°C (298 K), what is the standard reduction potentials for the given half-reaction? Cu2T + 2e' » Cu

A. 0.24 v

B. 0.40 v

C. 0.30 v

D. 0.34 v

66: Consider that aqueous potassium chloride is added to aqueous silver nitrate for forming a silver chloride precipitate plus aqueous potassium nitrate. Which of the following is the net ionic equation fc this?

A. C|'(aq) + Ag+(aq) ~> AgcI(s)

B. KCl(aq) 1‘ AgNoslaq) * AQCI(S) + K‘iaq) + NO3'(aq)

C. K+(laq) + C|'(aq) + A9789) + N03'(aq) * AQCI'ISI + KNO3+(aq)

D. K+(aq) + 0189) + A9789) + No3‘(aq) .. A9C|(s) + K769) + NO2'(aq)

67: According to the third law of thermodynamics, which of the following options is the value of the entropy of a perfect crystal at 0 K?

A. Zero

B. One

C. Two

D. Three

68: Which of the following chemical reactions will take place when the solutions of Na2504(aq) is mixed with Pb(N03)2 (aq)?

A. Na2so4(aq) + PblN03)2 (aq) -’ 2N602 (S) + Pb (I) 1‘ 2N02 (9) + 502 (9)

B. Na2so4(aq) + 2PblN03I2 (6m) -* ZNBPb (S) + 2N02 (9)+ 502 (9) + 202 (9)

C. Na2SO4(aq) + Pb(N03)2 (aq) -v PbSO4 (s) + 2NaNO3 (aq)

D. Na2S04(aq) + Pb(N03)2 (aq) » Pb504 (s) + 2Na20 (aq) + N02 (9)

69: Which of the following laws of chemistry states that the pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases?

A. Dalton‘s Law

B. Dulong & Petit's Law

C. Def‌inite Composition

D. Fa raday's Law

70: Consider a molecule of N2 at a temperature of 293 K with a mass of 4.6 X 102'3 kg. Which of the following options is a correct value of the velocity of nitrogen molecule, if its kinetic energy is 3ka/2 and the velocity is mv2/2? (Value of kb is 1.4 x1023)

A. 555 ms

B. 580 ms”1

C. 500 ms“

D. 520 ms-1

71:

In the given image. which of the following options is a utility clamp?

A.

i)

B.

ii)

C.

iii)

D.

iv)

72:

In the given image. which of the following chemical reactions correctly expresses the decomposition of magnesium nitride?

A.

i)

B.

ii)

C.

iii)

D.

iv)

73: Which of the following chemical reactions correctly explains the oxidization of hydrobromic acid by atmospheric oxygen?

A. 2HBr + 02 = H20 + BrO.

B. 4HBr + 02 = 21-120 + 2Br2.

C. 2HBr + 02 = H20 + Brzo-

D. 4HBr + 202 = 21-102 + 2Br2H.

74: What is the color of Phenolphthalein indicator with H‘?

A. pink

B. Orange

C. Violet-pink

D. Colorless

75:

If the Ka value for AI(H20)53' is 1.4 x10‘5, then which of the following options is the correct value of the pH of 0.010 M AICI3?

A. 2.18

B. 4.56

C. 3.43

D. 1.22

76: On dissolving 1.355 gm of a substance in 55 gm of acetic acid results a depression of 0.618°C in the freezing point. If the molecular depression of the freezing point of 100 gm acetic acid is 385°C, then what will be the correct molecular weight of the dissolved substance?

A. 86.7

B. 103.8

C. 135.2

D. 153.5

77:

In the given image, which of the following chemical reactions correctly represents the process of dissolution of ammonium nitrate (NH4N03) in water?

A.

i)

B.

ii)

C.

iii)

D.

iv)

78: Convert the temperature of 40°C into Kelvin (K) and Fahrenheit (°F).

A. 315.2 K, 100°F

B. 313.2 K. 104°F

C. 313.2 K, 100°F

D. 315.2 K, 104°F

79: While using the Carius method for an estimation of sulphur, 0.2175 gm of the substance gave 0.5825 gm of barium sulphate. Which of the following options will be the correct percentage of sulphur in this substance?

A. 36.77%

B. 28.58%

C. 41.93%

D. 45.54%

80: In the chemistry lab, which of the following equipments is used to dispense and transfer the known volumes of fluids?

A. Striker

B. Test tube

C. Disposable pipet

D. Buret

81: If the Ka value for HF is 7.2 X 10“, then what is the correct pH of 0.30 M NaF solution?

A. 5.15

B. 10.22

C. 6.72

D. 8.31

82: PbSOa is precipitated on mixing the aqueous solution of Na2804 and Pb2(NO3)2. If 1.25 L of 00500 M Pb2(N03)2 and 2.00 L of 0.0250 M Na2504 are mixed. then what is the mass of PbSOa formed?

A. 20.8 g

B. 17.5 g

C. 15.2 g

D. 16.4 g

83:

What output is obtained after the given expression is simplified?

A.

xz8

B.

Y26

C.

xyz1

D.

X'IY'lz8

84:

Which of the following two roots are produced after the simplif‌ication of the given quadratic equation?

3x2 -4x + 1

A.

x =1/2, -⅔

B.

x =1,⅓

C.

x = 4/2, 213

D.

X: 2.1/2

85: What is the density of H2O at 25° C?

A. 0.9970 g cm‘3

B. 1.044 g cm'3

C. 0.576 g cm'3

D. 1.540 g cm‘3

86: In order to prepare 2.5 L of a 0.10 M HzSOd solution, what volume of 26 M sulphuric acid must be used?

A. 8.9 mL

B. 9.1 mL

C. 9.6 mL

D. 8.2 mL

87: Which of the following options is used for lighting the bunsen burner?

A. Hot plate

B. Buret

C. Striker

D. Fume hood

88: Which of the following radioactive nuclides is used for studying the bones?

A. 51Cr

B. 87Sr

C. 133Xe

D. 5S‘Fe

89: Which of the following statements is true?

A. Separation of bromine from the aqueous solution of bromides is caused by potassium lichromate in the presence of dilute sulfuric acid.

B. Separation of bromine from a dilute bromide solution in the cold is caused by nitrous acid.

C. Hydrobromic acid is oxidised more readily by potassium permanganate as compared to iydrochloric acid.

D. None of the above.

90: The aqueous solution of which of the following salts will be neutral?

A. NH4C2H302

B. NHACN

C. A|2(504)3

D. None of the above.

91: Which of the following options is the def‌inition of acid according to the Bronsted-Lowry model of acids and bases?

A. It is the producer of H”.

B. It is an electron-pair acceptor.

C. It is the donor of H’.

D. None of the above.

92:

Which of the following options is the correct value of change in energy?

A.

-2.02 X1012 J/mol

B.

-3.58 x1010 J/mol

C.

-1.23 x1013 J/mol

D.

-5.82 x1013 J/mol

93: At 25°C. what is the enthalpy of formation for C02 (g)?

A. —345 kJ/mol

B. -269 kJ/mol

C. -231 kJ/mol

D. 394 kJ/mol

94: If 890 kJ of energy is released as heat on burning 1 mole of methane (CH4) at a constant pressure. then what is the AH for a process in which a 9.6-9 sample of methane is burned at the constant pressure?

A. -492 KJ

B. -530 KJ

C. -534 KJ

D. -480 KJ

95: Which of the following options is the correct oxidation state of the carbon atom in C02?

A. +2

B. +4

C. +1

D. +3

96: Which of the following chemical reactions takes place when vanadium pentoxide is heated with chlorine gas in the presence of carbon at 750°C?

A. v205 + 3c + 302 -> 2voc13 + 3CO

B. V205 + 4C + 80; -> 2VOC|4 + C02 + VC30

C. 2V205 + 5C + 8Cl2 -v 4VCI4 + 5C02

D. 2V205 + C + 4C1; -> 4VCI2 + C02 + 03

97: What is the correct molecular weight of chlorine dioxide (CIO2)?

A. 65.27

B. 61.52

C. 69.12

D. 67.45

98:

Which of the following options is the pertinent half-reactions for a galvanic cell based on the given redox reaction?
Fe3'(aq) + Cu(s)-> Cuz'laq) + Fe2'(aq)

A.

Fe3+ + 39‘ -> Fe

CuZ' + 2 e‘ » Cu

B.

Fe3' + e' -> Fez'

Cuz' + 2e’ » Cu

C.

Fe3’ + e‘ ~ Fez

Cuz' + e' -> Cu"

D.

Fe3' + 2e‘ -> Fe'

Cuz' + my » Cu

99: In a sample of helium gas at 25°C, what is the root mean square velocity for the atoms?

A. 2.16 x 103 m/s

B. 1.81 x103 m/s

C. 1.36 x 103 m/s

D. 2.45 x103 m/s

100: According to the third law of thermodynamics. which of the following options is the value of the entropy of a perfect crystal at 0 K?

A. Zero

B. One

C. Two

D. Three

Chemistry MCQs

Chemistry MCQs Topics

Chemistry MCQs

1: A sample of 502 has volume 2.45 L at a pressure of 4.6 x103 Pa. What he new volume of the gas, if the pressure is changed to 1.4 x104 Pa and the temperature is kept constant?

2: At 298 K and 1 atmospheric pressure, a given mass of gas occupies the 30 mL volume. If the pressure is increased to 1.50 atmosphere and the temperature is kept constant. then what is the volume of the gas?

3: If the volume of a sample of a gas at 15°C and 1 aim is 3.12 L. then what is the volume of this gas at 42"C and 1 atm?

4: If the partial pressure of oxygen in air is 184 torr and the total atmospheric pressure is 782 torr, then what is the mole fraction of 02 present?

5: Which of the following options is the correct bond length of CC (Alkanes) bond?

6: Which of the following options is the correct bond energy of C—Br bond?

7: What is the correct atomic radii (pm) of hydrogen (H)?

8: A solution is prepared by dissolving 11.5 g of solid NaOH in enough water for making 1.40 L of the solution. What is the molarity of this solution?

9: How many protons are dissociated by polyprotic acids at a time?

10: Which of the following options is the correct Ka value of the oxyacid HCIO2?

11: What is the correct value of the pH of 1.0 X 10‘10 M HCl?

13: Which of the following options is the correct value of the molecular mass of hydrated copper sulphate (CuSoa . SHZO)?

16: On heating 0.197 gm of an organic substance with excess of strong nitric acid and silver nitrate gives 3.525 gm of silver iodide. What will be the percentage of iodine in this compound?

17: In relation to the oxidation-reduction process, which of the following statements is NOT correct about an oxidized element?

18: Which of the following chemical reactions takes place between silver nitrate and the solution of neutral tartrate?

19: While dissolving 0.3 mol NH3 (g) in 54.045 9 H20 (l) at 25°C and pressure 101.325 kPa, it was found that a heat of 6870 J passed to the surroundings. Calculate the correct value of me].

20: With regard to the radioactive processes, what is the effect of positron production on neutron/proton ratio?

22: Which of the following options dissolved in chloroform is used as a nitrating agent in the organic synthesis?

23: What is the life of the uranium nuclide in the decay of Uranium — 234 (atomic number — 92) which decays to Thorium ~230 (atomic number — 90) and produces an a particle?

24: It is given that the mass of an article is 150 Q. What is the mass of the article in ounces?

25: In relation to acid-base properties of salts, which of the following options results in the production of basic solutions?

26: During which of the following types of chemical reactions, an insoluble substance, such as a solid is formed and is separated from the solution on mixing of the two solutions?

29: In relation to the ion-selective electrodes, which of the following options is used as a reference solution?

30: Which of the following chemical equations correctly represents the reaction that takes place when phosphonium iodide is heated at 60°C?

31: What is the standard reduction potential for the given reaction at 25°C? H202 (aq) + 2H1”) + 2e’-> 2H20 (I)

32: Which of the following chemical reactions correctly illustrates the heating of iron disulphate (FeSQ) at 600°C in a vacuum?

33: In relation to the base strength in aqueous solutions, which of the following options has the highest base strength?

34: Complete the given chemical reaction. Cuso4 + 2Kl 4

37: The stirring rod is made of which of the following material?

38: Which of the following options is the correct wavelength range of infrared radiations?

39: What is the percent dissociation of an acetic acid (KB =18 x10‘5) in 0.100 M HC2H3O2 solution?

40: In relation to corrosion, which of the following chemical reaction equations is correct?

42: Which of the following laws of chemistry states that the mole fraction of a gas dissolved in a solvent is directly proportional to the partial pressure of the gas?

43: If the half-life of molybdenum-99 is 67.0 h, then how much of a 1.000-mg sample of Mo (atomic weight = 99 and atomic number = 42) is left after 335 h?

44: What is the correct molecular formula of an organic compound that has the molecular weight of 90 and the empirical formula CHZO? It is given that, C =12, H =1, and 0 =16.

45: At a temperature of100°C and at a pressure of 27.6 MP8, the volume Occupied by two moles of carbon dioxide is 140.06 cm3. What will be the compressibility factor?

46: What is the correct elemental composition of Chromium Chloride?

47: Which of the following statements is not correct about heat?

48: Which of the following statements is not correct about the kinetic molecular theory of gases?

49: Which of the following laws of chemistry states that the molar volume of different gases at the same temperature and pressure has the same value?

51: Which of the following options is the correct Lewis structure of the nitrogen molecule (N2)?

52: Which of the following types of molecules shows an inductive effect?

54: A gas is expanded from 36 L to 59 L at a constant external pressure of17 atm. What is the work associated with the expansion?

55: What is the normal boiling temperature of ethanol?

56: What is the correct boiling point of pure nitric acid (HNO3)?

57: In relation to analytical chemistry, which of the following types of metals are present in the second group of metals?

61: Consider a system undergoing an endothermic process in which 18.2 kJ of heat flows and where 1.6 kJ of work is done on the system. What is the value of AE for this system?

64: Which of the following options is the correct formula equation for the chemical reaction where aqueous potassium hydroxide is mixed with aqueous iron(lll) nitrate?

66: Consider that aqueous potassium chloride is added to aqueous silver nitrate for forming a silver chloride precipitate plus aqueous potassium nitrate. Which of the following is the net ionic equation fc this?

67: According to the third law of thermodynamics, which of the following options is the value of the entropy of a perfect crystal at 0 K?

68: Which of the following chemical reactions will take place when the solutions of Na2504(aq) is mixed with Pb(N03)2 (aq)?

69: Which of the following laws of chemistry states that the pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases?

73: Which of the following chemical reactions correctly explains the oxidization of hydrobromic acid by atmospheric oxygen?

74: What is the color of Phenolphthalein indicator with H‘?

76: On dissolving 1.355 gm of a substance in 55 gm of acetic acid results a depression of 0.618°C in the freezing point. If the molecular depression of the freezing point of 100 gm acetic acid is 385°C, then what will be the correct molecular weight of the dissolved substance?

78: Convert the temperature of 40°C into Kelvin (K) and Fahrenheit (°F).

79: While using the Carius method for an estimation of sulphur, 0.2175 gm of the substance gave 0.5825 gm of barium sulphate. Which of the following options will be the correct percentage of sulphur in this substance?

80: In the chemistry lab, which of the following equipments is used to dispense and transfer the known volumes of fluids?

81: If the Ka value for HF is 7.2 X 10“, then what is the correct pH of 0.30 M NaF solution?

82: PbSOa is precipitated on mixing the aqueous solution of Na2804 and Pb2(NO3)2. If 1.25 L of 00500 M Pb2(N03)2 and 2.00 L of 0.0250 M Na2504 are mixed. then what is the mass of PbSOa formed?

85: What is the density of H2O at 25° C?

86: In order to prepare 2.5 L of a 0.10 M HzSOd solution, what volume of 26 M sulphuric acid must be used?

87: Which of the following options is used for lighting the bunsen burner?

88: Which of the following radioactive nuclides is used for studying the bones?

89: Which of the following statements is true?

90: The aqueous solution of which of the following salts will be neutral?

91: Which of the following options is the def‌inition of acid according to the Bronsted-Lowry model of acids and bases?

93: At 25°C. what is the enthalpy of formation for C02 (g)?

94: If 890 kJ of energy is released as heat on burning 1 mole of methane (CH4) at a constant pressure. then what is the AH for a process in which a 9.6-9 sample of methane is burned at the constant pressure?

95: Which of the following options is the correct oxidation state of the carbon atom in C02?

96: Which of the following chemical reactions takes place when vanadium pentoxide is heated with chlorine gas in the presence of carbon at 750°C?

97: What is the correct molecular weight of chlorine dioxide (CIO2)?

99: In a sample of helium gas at 25°C, what is the root mean square velocity for the atoms?

100: According to the third law of thermodynamics. which of the following options is the value of the entropy of a perfect crystal at 0 K?

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