Recommended PYQs (STRICTLY NCERT Based) Equilibrium Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

For the reaction

2 A ⇌ B + C, K_{c} = 4 \times 10^{- 3}

$2 \mathrm{~A} \rightleftharpoons \mathrm{B}+\mathrm{C}, \mathrm{K}_{\mathrm{c}}=4 \times 10^{-3}$ . At a given time, the composition of reaction mixture is :

[A] = [B] = [C] = 2 \times 10^{- 3} M .

$[\mathrm{A}]=[\mathrm{B}]=[\mathrm{C}]=2 \times 10^{-3} \mathrm{M} \text {. }$
In light of the above facts, which of the following is correct?

1.	Reaction has a tendency to go in the forward direction.
2.	Reaction has a tendency to go in the backward direction.
3.	Reaction has gone to completion in the forward direction.
4.	Reaction is at an equilibrium.

Subtopic: Kp, Kc & Factors Affecting them | Le Chatelier's principle |

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Q2:

In which of the following equilibria,

K_{p}

$\text{K}_\text{p}$ and

K_{c}

$\text{K}_\text{c}$ are NOT equal?

1.

H_{2 (g)} + I_{2 (g)} ⇌ 2 {H I}_{(g)}

$\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{HI}_{(\mathrm{g})}$
2.

{C O}_{(g)} + H_{2} O_{(g)} ⇌ {C O}_{2 (g)} + H_{2 (g)}

$\mathrm{CO}_{(\mathrm{g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})} \rightleftharpoons \mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_{2(\mathrm{~g})}$
3.

2 {B r C l}_{(g)} ⇌ {B r}_{2 (g)} + {C l}_{2 (g)}

$2 \mathrm{BrCl}_{(\mathrm{g})} \rightleftharpoons \mathrm{Br}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$
4.

{P C l}_{5 (g)} ⇌ {P C l}_{3 (g)} + {C l}_{2 (g)}

$\mathrm{PCl}_{5(\mathrm{~g})} \rightleftharpoons \mathrm{PCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$

Subtopic: Kp, Kc & Factors Affecting them |

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Q3:

Consider the following reaction in a sealed vessel at equilibrium with concentrations of

N_{2} = 3.0 \times 10^{- 3} M, O_{2} = 4.2 \times 10^{- 3} M

$\text{N}_2=3.0 \times 10^{-3} \text{M}, \text{O}_2=4.2 \times 10^{-3} \text{M}$ and

NO = 2.8 \times 10^{- 3}

$\text{NO}=2.8 \times 10^{-3}$

2 {NO}_{(g)} ⇌ N_{2 (g)} + O_{2 (g)}

$2 \text{NO}_{(\text{g})} \rightleftharpoons \text{N}_{2(\text{g})} +\text{O}_{2\text{(g)}}$
If 0.1 mol L^-1 of NO_(g) is taken in a closed vessel, what will be the degree of dissociation (

α

$\alpha$ ) of NO_(g) at equilibrium?

1. 0.0889
2. 0.8889
3. 0.717
4. 0.00889

Subtopic: Ionisation Constant of Acid, Base & Salt |

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Q4:

Consider the reaction in equilibrium

{P C l}_{5} = {P C l}_{3} + {C l}_{2}

$\mathrm{PCl}_5=\mathrm{PCl}_3+\mathrm{Cl}_2$
at

500 K .

$500 \mathrm{~K} .$ The concentration of

{P C l}_{5} = 1.40 M,

$\mathrm{PCl}_5=1.40~ \mathrm{M} \text {, }$ concentration of

{C l}_{2} = 1.60 M,

$\mathrm{Cl}_2=1.60~ \mathrm{M} \text {, }$ concentration of

{P C l}_{3} = 1.60 M

$\mathrm{PCl}_3=1.60 \mathrm{M}$ . Calculate

K_{c}

$K_c$ :

1. 2.00
2. 2.6
3. 1.83
4. 3.4

Subtopic: Kp, Kc & Factors Affecting them |

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Q5:

For the equilibrium

2 N O C l_{(g)} ⇌ 2 N O_{(g)} + C l_{2 (g)}

$\mathrm{2NOCl_\text{(g)}\rightleftharpoons2NO_{\text{(g)}}+Cl_{2{\text{(g)}}}}$
the value of the equilibrium constant is

3.0 \times 10^{- 6}

$3.0\times10^{-6}$ at

1000 K .

$1000~K.$ Find

K_{p}

$K_p$ for the reaction at this temperature (Given

R : 8.314 {J K}^{- 1} {mol}^{- 1}

$R:8.314~\text{J K}^{-1}\text{mol}^{-1}$ ):

1.

1.493

$1.493$
2.

2.494 \times 10^{- 2}

$2.494\times10^{-2}$
3.

3.0 \times 10^{- 6}

$3.0\times10^{-6}$
4.

2.494 \times 10^{- 4}

$2.494\times10^{-4}$

Subtopic: Kp, Kc & Factors Affecting them |

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Q6:

At a given temperature and pressure, the equilibrium constant value for the equilibria are given below:

3 A_{2} + B_{2} ⇌ 2 A_{3} B, K_{1} A_{3} B ⇌ \frac{3}{2} A_{2} + \frac{1}{2} B_{2}, K_{2}

$3A_2+B_2\rightleftharpoons 2A_3B, K_1\\ A_3B \rightleftharpoons \frac 3{2}A_2+\frac 1{2}B_2, K_2$
The relation between

K_{1}

$K_1$ and

K_{2}

$K_2$ is:
1.

K_{1}^{2} = 2 K_{2}

$K^2_1=2K_2$
2.

K_{2} = \frac{K_{1}}{2}

$K_2= \frac { K_1 }{2}$
3.

K_{1} = \frac{1}{{\sqrt{K}}_{2}}

$K_1=\frac 1{\sqrt K_2}$
4.

K_{2} = \frac{1}{{\sqrt{K}}_{1}}

$K_2=\frac 1{\sqrt K_1}$

Subtopic: Introduction To Equilibrium |

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Q7:

For the reaction in equilibrium

N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g), Δ H = - Q

$\mathrm{N_2(g) +3H_2(g) \rightleftharpoons 2NH_3(g), \Delta H=-Q}$
Reaction is favoured in forward direction by:

1.	Use of catalyst
2.	Decreasing concentration of $\mathrm{N_2}$
3.	Low pressure, high temperature and high concentration of ammonia
4.	High pressure, low temperature and higher concentration of $\mathrm{H_2}$

Subtopic: Le Chatelier's principle |

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Q8:

The ratio of solubility of

A g C l

$\mathrm{AgCl}$ in

0.1 M K C l

$0.1~ \mathrm{M} ~\mathrm{KCl}$ solution to the solubility of

A g C l

$\mathrm{Ag} \mathrm{Cl}$ in water is:
(Given: Solubility product of

A g C l = 10^{- 10}

$\mathrm{AgCl}=10^{-10}$ )

1.	$10^{-4}$	2.	$10^{-6}$
3.	$10^{-9}$	4.	$10^{-5}$

Subtopic: Solubility Product |

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Q9:

Amongst the given option which of the following molecules/ion acts as a Lewis acid?
1.

{OH}^{-}

$\text{OH}^-$
2.

{NH}_{3}

$\text{NH}_3$
3.

H_{2} O

$\text H_2 \text O$
4.

{BF}_{3}

$\text{BF}_3$

Subtopic: Acids & Bases - Definitions & Classification |

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Q10:

The equilibrium concentration of the species in the reaction

A + B ⇌ C + D

$A+B \rightleftharpoons C+D$ are 2, 3, 10 and 6 mol L^–1, respectively at 300 K.

Δ G^{o}

$\Delta G^o$ for the reaction is: (R = 2 cal/mol K)

1.	–13.73 cal	2.	1372.60 cal
3.	–137.26 cal	4.	–1381.80 cal

Subtopic: Introduction To Equilibrium |

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