Chemistry Question Bank

4 moles of A are mixed with 4 moles of B. At equilibrium for the reaction A + B C + D, 2 moles of C and D are formed. The equilibrium constant for the reaction will be

The equilibrium constant for the reaction N2(g) + O2(g) 2NO(g) at temperature T is 4×10–4. The value of Kc for the reaction NO N (g) O (g) at the same temperature is

At a given temperature, the equilibrium constant for reaction PCl5(g) PCl3(g) + Cl2(g) is 2.4 × 10–3. At the same temperature, the equilibrium constant for reaction PCl3(g) + Cl2(g) PCl5(g) is

Two gaseous equilibria SO (g) O (g) SO3(g)and 2SO3(g) 2SO2(g) + O2(g) have equilibrium constants K1 and K2 respectively at 298 K. Which of the following relationships between K1 and K2 is correct

Equilibrium constants k1 and k2 for the following equilibria NO(g) + 1 2 O2 NO2(g) and 2NO2(g) 2NO(g) + O2(g) are related as (a) K K (b) K K (c) K K (d) K K

If K1 and K2 are respective equilibrium constants for the two reactions XeF6(g) + H2O (g) XeOF4(g) + 2HF (g) XeO4(g) + XeF6 (g) XeOF4(g) + XeO3F2(g) the equilibrium constant for the reaction XeO4(g) + 2HF (g) XeO3F2(…

If the equilibrium constant of the reaction 2HI H I is 0.25, then the equilibrium constant for the reaction H I 2HI would be

In the two gaseous reactions (i) and (ii), at 25ºC (i) NO(g) + 1/2O2(g) NO2(g); K1 (ii) 2NO2(g) 2NO(g) + O2 (g), K2 the equilibrium constants K1 and K2 are related as

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

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 …

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

Equilibrium in a system having more than one phase is called

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.

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

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

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

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

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 ?

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 (…

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

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…

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

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

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

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