Chemistry Question Bank

“Use of isotope (deuterium) in the formation of ammonia clearly indicates that chemical reactions do not reach a state of dynamic equilibrium in which the rates of forward and reverse reactions are unequal and there i…

Equilibrium can be attained

In chemical reaction A B, the system will be known in equilibrium when

According to law of mass action rate of a chemical reaction is proportional to

The rate constant for forward and backward reactions of hydrolysis of ester are 1.1 × 10–2 and 1.5 × 10–3 per minute respectively. Equilibrium constant for the reaction is CH3COOC2H5 + H2O CH3COOH + C2H5OH

The equilibrium constant in a reversible chemical reaction at a given temperature

Equilibrium constant for the reaction : 2NOg Cl g 2NOCl g is correctly given by the expression (a) [2 NOCl] K [2 NO][Cl ] (b) [NOCl] K [NO] [Cl ] (c) [NO] [Cl ] K [NO] [Cl ] (d) [NO] [Cl] K [NOCl]

Equilibrium constant for the reaction H I 2HI is correctly given by the expression (a) c [H ][I ] K [HI] (b) c [H ][I ] K [2 HI] (c) c [H ][I ] K [HI] (d) c [HI] K [H ][I ]

The active mass of 64 g of HI in a two litre flask would be

A mixture of reactants and products in the equilibrium state is called

The equilibrium equation is also known as the …X… because in the early days of chemistry, concentration was called …Y… Here, (X) and (Y) refer to

For a reaction, H g I g 2HI g c HI g K H g I g Point out the correct statement.

At a given temperature, the product of …X… of the reaction products raised to the respective stoichiometric of coefficient in the balanced chemical equation …Y… by the product of concentrations of the reactants raised…

Molar concentration of different species is indicated by enclosing these in square bracket and it is implied that these are

The following concentrations were obtained for the formation of NH3 from N2 and H2 at equilibrium at 500 K. N 1.5 10 M. x H 3.0 10 M x and NH 1.2 10 M. x Calculate the equilibrium constant. (a) 1.08 10 x (…

At equilibrium the concentrations of N 3.0 10 M x , O 4.2 10 M x and NO 2.8 10 M x in a sealed vessel at 800K. What will be Kc for the reaction, N g O g 2NO g ?

In a homogeneous system , all the reactants and products are in the

Which of the following reaction(s) is/are in homogeneous equilibria? (a) N g 3H g 2NH g (b) CH COOC H aq H O l CH COOH aq C H OH aq (c) Fe aq SCN aq Fe SCN aq

What is the relation between Kp and Kc for a general reaction, aA bB cC dD? (a) n p c K K RT (b) n c p K K RT (c) p n c K K RT (d) c n p K K RT

PCl5, PCl3 and Cl2 are at equilibrium at 500 K and having concentration 1.59 M PCl3, 1.59 M Cl2 and 1.41 M PCl5 . Calculate Kc for the reaction. PCl PCl Cl

For the equilibrium 2NOCl g 2NO g Cl g the value of the equilibrium constant, Kc is 3.75 10 x at 1069 K. Calculate the Kp for the reaction at this temperature.

Equilibrium in a system having more than one phase is called

Which of the following reactions (s) show(s) heterogeneous equilibria? (a) N g 3H g 2NH g (b) H O l H O g (c) CaCO s CaO s CO g

For CaCO s CaO s CO g ; the equilibrium constant (Kc and Kp) for the thermal decomposition of calcium carbonate is (a) c p CO K CO g ;K p (b) c p CaCO K CaCO s ;K p (c) c p CaO K CaO s ;K p …

K1 and K2 are equilibrium constant for reactions (1) and (2) N2(g) + O2(g) 2 NO (g) ....... (1) NO(g) N (g) O (g) .........(2) (a) K K