Chemical and Ionic Equilibrium MCQs Question and Answer in Engineering Chemistry

1

In the mixture obtained by mixing 25.0 mL × 1.2 × 10^-3 MMnCl₂ and 35.0 mL of 6.0 × 10^-4 M KCl solution, the concentration (M) of Mn²⁺, K⁺ and CI^- ions respectively are

A) 6.0 × 10^-4, 3.0 × 10^-4, 1.5 × 10^-3 B) 6.0 × 10^-4, 3.0 × 10^-4, 9 × 10^-4 C) 5.0 × 10^-4, 3.5 × 10^-4, 13.5 × 10^-3 D) 5.0 × 10^-4, 3.5 × 10^-4, 8.5 × 10^-4

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Answer & Solution

Answer: Option C

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2

An aqueous solution containing m moles of non-volatile solute freezes at -0.186°C. The elevation in the boiling point of the same aqueous solution (K_f = 1.86°, K_b = 0.512°) would be

A) 0.186 B) 0.512 C) 0.0512 D) 0.51/1.86

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Answer & Solution

Answer: Option C

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3

Among the following, the equilibrium which is not affected by an increase in pressure is

A) 2SO₃(g) $$ \rightleftharpoons $$ 2SO₂(g) + O₂(g) B) H₂(g) + l₂(s) $$ \rightleftharpoons $$ 2HI(g) C) C(s) + H₂O(g) $$ \rightleftharpoons $$ CO(g) + H₂(g) D) 3Fe(s) + 4H₂O(g) $$ \rightleftharpoons $$ Fe₃O₄(s) + 4H₂(g)

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Answer & Solution

Answer: Option D

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4

The number of degrees of freedom for a system consisting of NaCl(s), Na⁺ (aq) and Cl^- (aq) at equilibrium is

A) 2 B) 3 C) 4 D) 5

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Answer & Solution

Answer: Option B

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5

As per the kinetic theory of ideal gases, which of the following statements is not correct?

A) Gas particles have mass but no volume B) Particles are in a Brownian motion between collisions C) During the collision, the system does not lose energy D) Particles exert same force per unit area on all sides of the container

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Answer & Solution

Answer: Option D

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6

The number of degrees of freedom of a system consisting of solid sucrose in equilibrium with an aqueous solution of sucrose is

A) 0 B) 1 C) 2 D) 3

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Answer & Solution

Answer: Option C

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7

For an ideal gas,

A) $${\left( {\frac{{\partial p}}{{\partial T}}} \right)_V}{\left( {\frac{{\partial T}}{{\partial V}}} \right)_p}{\left( {\frac{{\partial V}}{{\partial p}}} \right)_T} = 0$$ B) $${\left( {\frac{{\partial p}}{{\partial T}}} \right)_V}{\left( {\frac{{\partial T}}{{\partial V}}} \right)_p}{\left( {\frac{{\partial V}}{{\partial p}}} \right)_T} = - 1$$ C) $${\left( {\frac{{\partial p}}{{\partial T}}} \right)_V}{\left( {\frac{{\partial T}}{{\partial V}}} \right)_p}{\left( {\frac{{\partial V}}{{\partial p}}} \right)_T} = + 1$$ D) $${\left( {\frac{{\partial p}}{{\partial T}}} \right)_V}{\left( {\frac{{\partial T}}{{\partial V}}} \right)_p}{\left( {\frac{{\partial V}}{{\partial p}}} \right)_T} = + 2$$

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Answer & Solution

Answer: Option A

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8

If a gas obeys equation of state p(V - nb) = nRT, the ratio $$\frac{{\left( {{C_p} - {C_V}} \right)}}{{{{\left( {{C_p} - {C_V}} \right)}_{{\text{ideal}}}}}}$$ is

A) > 1 B) < 1 C) 1 D) (1 - b)

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Answer & Solution

Answer: Option C

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9

The internal pressure of a van der Waals gas is

A) independent of the molar volume B) inversely proportional to the molar volume C) inversely proportional to square of the molar volume D) directly proportional to the molar volume

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Answer & Solution

Answer: Option C

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10

Under the equilibrium conditions for the reaction, C(s) + CO₂(g) $$ \rightleftharpoons $$ 2CO(g), the total pressure is 12 atm. The value of K_p is

A) 16 B) 0.5 C) 2 D) 32

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Answer & Solution

Answer: Option A

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