Chemical Equilibrium MCQ Questions & Answers in Physical Chemistry | Chemistry

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161. For a reaction, $$2S{O_{2\left( g \right)}} + {O_{2\left( g \right)}} \rightleftharpoons 2S{O_{3\left( g \right)}},$$     $$1.5\,moles$$   of $$S{O_2}$$  and $$1\,mole$$  of $${O_2}$$  are taken in a $$2\,L$$  vessel. At equilibrium the concentration of $$S{O_3}$$  was found to be $$0.35\,mol\,{L^{ - 1}}.$$   The $${K_c}$$  for the reaction would be

A $$5.1\,L\,mo{l^{ - 1}}$$
B $$1.4\,L\,mo{l^{ - 1}}$$
C $$0.6\,L\,mo{l^{ - 1}}$$
D $$2.95\,L\,mo{l^{ - 1}}$$
Answer :   $$5.1\,L\,mo{l^{ - 1}}$$

162. What is observed at equilibrium point in the reaction?
$$PC{l_{5\left( g \right)}} \rightleftharpoons PC{l_{3\left( g \right)}} + C{l_{2\left( g \right)}}$$

A Equal volumes of $$PC{l_5},PC{l_3}$$   and $$C{l_2}$$  are present.
B Equal masses of $$PC{l_5},PC{l_3}$$   and $$C{l_2}$$  are present.
C The concentrations of $$PC{l_5},PC{l_3}$$   and $$C{l_2}$$  become constant.
D Reaction comes to a stop.
Answer :   The concentrations of $$PC{l_5},PC{l_3}$$   and $$C{l_2}$$  become constant.

163. At $$350\,K,{K_p}$$   for the reaction given below is $$3.0 \times {10^{10}}\,ba{r^{ - 1}}$$   at equilibrium. What will be the value of $${K_c}$$ at this temperature?
$$2{N_{2\left( g \right)}} + {O_{2\left( g \right)}} \rightleftharpoons 2{N_2}{O_{\left( g \right)}}$$

A $$7.4 \times {10^{11}}L\,mo{l^{ - 1}}$$
B $$8715 \times {10^{10}}\,L\,mo{l^{ - 1}}$$
C $$0.08\,L\,mo{l^{ - 1}}$$
D $$8.715 \times {10^{11}}\,L\,mo{l^{ - 1}}$$
Answer :   $$8.715 \times {10^{11}}\,L\,mo{l^{ - 1}}$$

164. For the reaction $$N{H_4}HS\left( g \right) \rightleftharpoons N{H_3}\left( g \right) + {H_2}S\left( g \right)$$       in a closed flask, the equilibrium pressure is $$P\,atm.$$  The standard free energy of the reaction would be :

A $$ - RT\,\ln \,p$$
B $$ - RT\left( {\ln \,p - {\text{ln}}\,2} \right)$$
C $$ - 2\,RT\,\ln \,p$$
D $$ - 2\,RT\left( {\ln \,p - \ln 2} \right)$$
Answer :   $$ - 2\,RT\left( {\ln \,p - \ln 2} \right)$$

165. Consider the equilibrium set up : $$2{H_{2\left( g \right)}} + C{O_{\left( g \right)}} \rightleftharpoons C{H_3}O{H_{\left( g \right)}}$$
What will be the effect of the following on the equilibrium of the reaction?
(i) Addition of $${H_2}$$
(ii) Addition of $$C{H_3}OH$$
(iii) Removal of $$CO$$
(iv) Removal of $$C{H_3}OH$$
(i)
(ii)
(iii)
(iv)
(a) Forward direction Backward direction Backward direction Forward direction
(b) Backward direction Backward direction Forward direction Forward direction
(c) Forward direction Forward direction Backward direction Backward direction
(d) Backward direction Forward direction Forward direction Backward direction

A (a)
B (b)
C (c)
D (d)
Answer :   (a)