Chemistry Question Bank

Solid Liquid Liquid Gas Solid Gas The above examples are called

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)

Variation of log K with 1 T is shown by the following graph. Hº for the reaction will be :

In a 1.0 L aqueous solution when the reaction (aq) (s) 2 Ag Cu (aq) (s) Cu 2 Ag reaches equilibrium, [Cu2+] = x M and [Ag+] = y M. If the volume of solution is doubled by adding water, then at equilibrium : (a) x …

Assertion : For a reaction at equilibrium, the free energy for the reaction is minimum. Reason : The free energy for both reactants and products decreases and become equal.

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)

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 …

In the equilibrium 2NH N 3H , 6 moles of is taken in 10 L flask. If concentration of at equilibrium is x, then concentration of at equilibrium is (DUMET 2008)

Now, the total pressure at equilibrium, p(1 α)+pα+0.5pα = P P p = ...(2) 1+0.5α From eq (1) and eq(2), p P P P K 0.5 1 + 0.5α K P 0.5 2K P x x

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

The equilibrium constants of the following are N 3H 2NH ;K N O 2NO;K H O H O;K The equilibrium constant (K) of the reaction : K 2NH O 2NO 3H O will be (NEET 2017) (a) K K K (b) K K K (c) K K K (d) K K K

A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the contain…

Which one of the following conditions will favour maximum formation of the product in the reaction, A2 (g) + B2 (g) X2 (g); rH = – X kJ? (NEET 2018)

In which of the following, the forward reaction is favoured by use of high pressure ?

Which one of the following information can be obtained on the basis of Le Chatelier principle ?

According the Le-Chatelier’s principle, adding heat to a solid and liquid in equilibrium will cause the

For the gas phase reaction 2 NO N2 + O2, H = – 43.5 Kcal mol–1which one of the statement below is true for N2 (g) + O2 (g) 2 NO (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