Chemical Equilibrium | JEE Main Chemistry Chapter Wise Question Papers

Q 21 :

The number of correct statement/s involving equilibria in physical processes from the following is ________ [2023]

(A) Equilibrium is possible only in a closed system at a given temperature.

(B) Both the opposing processes occur at the same rate.

(C) When equilibrium is attained at a given temperature, the value of all its parameters become equal.

(D) For dissolution of solids in liquids, the solubility is constant at a given temperature.

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(3)

Statements given in A, B and D are correct.

(C), when equilibrium is attained at a given temperature, the value of all its parameters becomes constant.

Q 22 :

$A (g) ⇌ 2 B (g) + C (g)$

For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time t is 720 mm Hg at a constant temperature T and constant volume V. The fraction of A(g) decomposed under these conditions is $x \times 10^{- 1}$ . The value of $x$ is ______ (Nearest Integer) [2023]

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(3)

$\begin{matrix} A(g) & ⇌ & 2 B(g) & + & C(g) \\ t = 0 & 450 & 0 & 0 \\ t = t & 450 - y & 2 y & y \end{matrix}$

$720 = 450 - y + 2 y + y$

$∴$ $y = 135$

$Now, fraction of$ $A_{(g)}$ $decomposed = \frac{135}{450} = 0.3 = 3 \times 10^{- 1} = x \times 10^{- 1}$

$∴$ $x = 3$

Q 23 :

A mixture of 1 mole of $H_{2} O$ and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium 40% of water by mass reacts with carbon monoxide according to the equation:

$CO (g) + H_{2} O (g) ⇌ {CO}_{2} (g) + H_{2} (g)$

The equilibrium constant $K_{c} \times 10^{2}$ for the reaction is ________. (Nearest integer) [2023]

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(44)

$\begin{matrix} CO & + & H_{2} O & ⇌ & {CO}_{2} & + & H_{2} \\ t = 0 & 1 & 1 & 0 & 0 \\ eq. & 1 - 0.4 & 1 - 0.4 & 0.4 & 0.4 \end{matrix}$

$V = 10 L$ $K_{C} = \frac{0.4 \times 0.4}{0.6 \times 0.6} = \frac{4}{9} = 0.44$

$K_{C} \times 100 = 44$

Q 24 :

4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ is ________. [2023]

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(1)

$\begin{matrix} H_{2} (g) & + & I_{2} (g) & ⇌ & 2 HI (g) \\ Initial moles & 4.5 & 4.5 & 0 \\ Moles at eq. & 4.5 - 1.5 = 3 & 4.5 - 1.5 = 3 & 3 \end{matrix}$

$K_{equilibrium} = \frac{{[HI]}^{2}}{{[H_{2}]}^{1} {[I_{2}]}^{1}} = \frac{{[3]}^{2}}{3 \times 3} = 1$

Topic Question Set

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Q 24 :

4.5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel. At equilibrium, 3 moles of HI were found. The equilibrium constant for $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ is ________. [2023]

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