On adding A to the reaction at equilibrium,  AB(s) $⇌$ A(g) + B(g), the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

(a) 1/2 of its original value

(b) 1/4 of it s original value

(c) 1/8 of its original value

(d) twice of its original value

Concept Questions :-

Introduction To Equilibrium
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

2 mole of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium 40% of PCl5 dissociated into PCl3 and Cl2. The value of the equilibrium constant is :

(a) 0.267

(b) 0.53

(c) 2.63

(d) 5.3

Concept Questions :-

KP/KC - Factors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Given, HF + H2O$\stackrel{{K}_{\mathit{a}}}{\to }$H3O+ + F-

F- + H2$\stackrel{{K}_{b}}{\to }$HF + OH-

which relation is correct?

(a) Kb =Kw                        (b) Kb =1/Kw

(c) Ka x Kb =Kw                 (d)  Ka/Kb = Kw

Concept Questions :-

Ki for Acid & Base
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The value sf Kp1 and Kp2 for the reactions

X$⇌$Y+Z                                          ....(1)

and      A$⇌$2B                                          ......(2)

are in the ratio 9:1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio:

(a) 1:9                                     (b) 36:1

(c) 1:1                                      (d) 3:1

Concept Questions :-

KP/KC - Factors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The relation for calculating pH of a solution containing weak acid and its salt is:

(a) pH = pKa + log

(b) pH = pKa - log

(c) pH = pKa + log

(d) pOH = pKa - log

Concept Questions :-

Introduction To Equilibrium
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The equilibrium constants for the reaction,

A2 $⇌$2A at 500 K and 700 K are 1x10-10 and 1x10-5. The given reaction is

(a) exothermic                    (b) slow

(c) endothermic                  (d) fast

1. a,b

2.c,b

3.a,d

4 c,d

Concept Questions :-

Introduction To Equilibrium
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

For the chemical reaction, ;

the amount of X3Y at equilibrium is affected by :

(a) temperature and pressure

(b) temperature only

(c) pressure only

(d) temperature, pressure and catalyst

Concept Questions :-

Le Chatelier
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

H2S gas when passed through a solution of cations containing HCl precipitates the cations of seccond group in qualitative analysis but not those belonging to the fourth group. It is because

(a) presence of HCl decreases the sulphide ion concentration

(b) presence of HCl increases the sulphide ion concentration

(c) solubility product of group II sulphides is more than that of group IV sulphides

(d) sulphides of group IV cations are unstable in HCl

Concept Questions :-

Common Ion Effect
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The equilibrium constant Br2 $⇌$2Br at 500 K and 700 K are 10-10 and 10-5 respectively. The reaction is:

(a) endothermic                                  (b) exothermic

(c) fast                                               (d) slow

1. a,b

2.c,b

3.a,d

4 c,d

Concept Questions :-

KP/KC - Factors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Solubility of a gas in liquid increases on:

(b) increasing the pressure

(c) decreasing the pressure

(d) increasing the temperature

Concept Questions :-

Le Chatelier