Chemistry Question Bank

For a reversible reaction : A + B C dx dt = 2.0 × 103 L mol–1 s–1 [A] [B] – 1.0 × 102 s–1 [C] where x is the amount of ‘A’ dissociated. The value of equilibrium constant (Keq) is :

Equimolar concentrations of H and I are heated to equilibrium in a 2 L flask. At equilibrium, the forward and the backward rate constants are found to be equal. NH N NH What percentage of initial concentration of H …

For the reaction C(s) CO (g) 2CO(g) The partial pressure of CO and CO are 2.0 and 4.0 atm respectively then equilibrium p K for the reaction will be (BCECE 2008)

Three moles of PCl , three moles of PCl and two moles of Cl are taken in a closed vessel. If at equilibrium the vessel has 1.5 moles of PCl , the number of moles of PCl present in it is (KCET 2008)

5 moles of SO and 5 moles of O are allowed to react. At equilibrium, it was found that 60% of SO is used up. If the total pressure of the equilibrium mixture is one atmosphere, the partial pressure of is (KCET 2009)

2HI g H g I g The equilibrium constant of the above reaction is 6.4 at 300 K. If 0.25 mole each of H and 2I are added to the system, the equilibrium constant will be (KCET 2009)

p K and p K are the equilibrium constants of the two reactions, given below (AMU 2009) N g H g NH g N g 3H g 2NH g Therefore p K and p K are related by (a) p p K K (b) p p K K (c) p p K 2K (d) p p K K

Two moles of each reactant A and B are taken in a reaction flask. They react in the following manner, A(g) B(g) C(g) D(g) At equilibrium, it was found that the concentration of C is triple to that of B. The equili…

Standard free energy change for an equilibrium is zero, the value of Kp is (HARYANA PMT 2009)

Assertion For the reaction, 2NO g O g 2NO Increase in pressure favours the formation of NO2. Reason The reaction is exothermic (AIIMS 2009)

Which reaction is not affected by change in pressure? (AFMC 2009) (a) (g) (g) (g) H I 2HI (b) (s) (g) (g) 2C O 2CO (c) (s) (g) (g) N 3H 2NH (d) (g) (g) (g) PCl PCl Cl

For the equilibrium, 2NO (g) N O (g) 14.6 kcal, (CPMT 2009) Increase in temperature

For an equilibrium reaction, the rate constants for the forward and the backward reaction are 2.38 × 10–4 and 8.15 × 10–5 respectively. What will be the equilibrium constant for the reaction ? (RPMT 2010)

For the reaction, AB g A g B g AB is 33% dissociated at a total pressure of p. Therefore, p is related to by one of the following options (AMU 2010)

In which of the following equilibrium Kc and Kp are not equal? (AIPMT 2010) (a) 2C s O g 2CO g (b) 2NO g N g O g p K (c) SO g NO g SO g NO g (d) H g I g 2HI g

At 450 K, p K 2.0 / bar x for the given reaction at equilibrium 2SO (g) O (g) 2SO (g) (HARYANA PMT 2010) What is c K at this temperature ? (a) 73.8 x (b) 7.38 10 x

The relation between p c K and K for the following reaction is (JCECE 2010) N (g) 3H (g) 2NH (g) -> (a) p c K K (RT) (b) c p K K (RT) (c) c p K K (RT) (d) p c K K (RT)

In which one of the following gaseous equilibria, p K is less than c K ? (CMC LUDHIYANA 2010) (a) N O 2NO (b) 2SO O 2SO (c) 2HI H I (d) N O 2NO

What is c K for the following equilibrium when equilibrium concentration of each substance is [SO ] 0.60 M, [O ] 0.82 M and [SO ] 1.90 M ? (VMMC 2010) 2SO (g) O (g) 2SO (g)

For the reaction, N (g) O (g) 2NO(g) , the equilibrium constant is K1. The equilibrium constant is K2 for the reaction, 2NO(g) O (g) 2NO (g) . What is K for the reaction NO (g) N (g) O (g) (AIPMT 2011) (a) (K…

Consider the following gaseous equilibria with equilibrium constants K1 and K2 respectively. SO g O g SO g (KCET 2011) 2SO g 2SO g O g The equilibrium constants are related as (a) 2K K (b) K K (c) K K (d)…

The value of H for the reaction, (AIPMT 2011) X g 4Y g 2XY g is less than zero. Formation of XY4(g) will be favoured at

In the reaction, AB (g) A(g) + B(g) at 30ºC, Kp for the dissociation equilibrium is 2.56 × 10–2 atm. If the total pressure at equilibrium is 1 atm, then the percentage dissociation of AB is (KERELA CEE 2011)

For the reaction, C(s) + CO2(g) 2CO(g), p K 63atm at 1000 K. If at equilibrium CO CO p 10p , than the total pressure of the gases at equilibrium is (KERELA CEE 2011)

For the reversible reaction (AIPMT 2014) N (g) 3H (g) 2NH (g) Heat The equilibrium shifts in forward direction