Chemical and Ionic Equilibrium MCQs Question and Answer in Engineering Chemistry

11

Chemical and Ionic Equilibrium mcq question image

According to the Ehrenfest classification of phase transition the above diagram refers to

A) zeroth order phase transition B) first order phase transition C) second order phase transition D) λ transition

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Answer & Solution

Answer: Option B

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12

For 1 mol of a monoatomic ideal gas, the relation between pressure (p), volume (V) and average molecular kinetic energy $$\left( {\overline \varepsilon } \right)$$ is

A) $$p = \frac{{{N_A}\overline \varepsilon }}{V}$$ B) $$p = \frac{{{N_A}\overline \varepsilon }}{{3V}}$$ C) $$p = \frac{{2{N_A}\overline \varepsilon }}{{3V}}$$ D) $$p = \frac{{2{N_A}}}{{2V\overline \varepsilon }}$$

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Answer & Solution

Answer: Option C

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13

For the pair of reactions given below,
(i) N₂(g) + 3H₂(g) $$ \rightleftharpoons $$ 2NH₃(g)
(ii) $$\frac{1}{2}$$N₂(g) + $$\frac{3}{2}$$H₂(g) $$ \rightleftharpoons $$ NH₃(g)
If at a particular temperature, K_p1 and K_p2 are the equilibrium constants for reactions (i) and (ii) respectively then

A) K_p1 = 2K_p2 B) K_p1 = $${\text{K}}_{{\text{p2}}}^2$$ C) 2K_p1 = K_p2 D) $${\text{K}}_{{\text{p1}}}^2$$ = K_p2

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Answer & Solution

Answer: Option B

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14

The Bronsted acidity of boron hydrides follows the order

A) B₂H₆ > B₄H₁₀ > B₅H₉ > B₁₀H₁₄ B) B₂H₆ = B₄H₁₀ > B₅H₉ = B₁₀H₁₄ C) B₁₀H₁₄ > B₅H₉ > B₄H₁₀ > B₂H₆ D) B₅H₉ > B₄H₁₀ > B₂H₆ > B₁₀H₁₄

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Answer & Solution

Answer: Option C

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15

The pH of buffer solution containing 4 × 10^-3 and 0.4 moles of acetic acid (pK_a = 4.76) and sodium acetate respectively will be

A) 6.76 B) 4.76 C) 2.76 D) 0.76

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Answer & Solution

Answer: Option A

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16

The freezing point constant for water is 1.86 K (mol/kg)^-1. The freezing point when 0.01 mol glucose is added to 1 kg water is

A) 1.86 K B) -1.86 K C) 0.0186 K D) -0.0186 K

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Answer & Solution

Answer: Option D

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17

On the pressure-temperature diagram for a one-component system, the point where the solid-liquid and the liquid-gas curves intersect is

A) triple point B) critical point C) melting point D) boiling point

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Answer & Solution

Answer: Option A

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18

The triple point for water is

A) unique B) depends on p but is independent of T C) depends on T but is independent of p D) depends on both p and T

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Answer & Solution

Answer: Option D

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