Chemical Equilibrium MCQ Question with Answer

Chemical Equilibrium MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 1
Once the equilibrium is reached under given condition:

Cone, remains the same in spite of the change in temperature
Cone, of all the substances presents do not change
Cone, of reactants remairfs same
Cone, of products remains same

Question No : 2
For the reaction ${H}_{2}+{I}_{2}⇋2HI$ the equilibrium constant (K) is

$\frac{{\left[HI\right]}^{2}}{{\left[{H}_{2}\right]}^{2}\left[{I}_{2}\right]}$
$\frac{\left[HI\right]}{\sqrt{\left[{H}_{2}\right]}\sqrt{\left[{I}_{2}\right]}}$
$\frac{\left[{H}_{2}\right]\left[{I}_{2}\right]}{{\left[H+I\right]}^{2}}$
$\frac{{\left[HI\right]}^{2}}{\left[{H}_{2}\right]\left[{I}_{2}\right]}$

Question No : 3
$PC{L}_{5}$is kept in a closed container at a temperature of 250 K the equilibrium concentration of the different substances is The value of equilibrium constant for the reaction $PC{L}_{5}⇋PC{L}_{3}+C{L}_{2}$ will be

50
50.4
0.0205
0.205

Question No : 4
Equilibria are those in which the reactants and products are present in more than phases:

Physical
Heterogeneous
Chemical
Homogeneous

Question No : 5
Equilibrium constant changes with

time
temperature
pressure
both temperature and concentration

Question No : 6
The equilibrium constant $\left(K\right){H}_{2}S\left(g\right)⇋{H}_{2}\left(g\right)+\frac{1}{2}{S}_{2}\left(g\right)$ at 1400 K is 23.90. The equilibrium constant for the reaction $2{H}_{2}S⇋2{H}_{2}\left(g\right)+{S}_{2}\left(g\right)$ at 1400 K will be

571.20
47.80
371.20
59.543

Question No : 7
Equilibrium constant for the reaction $PC{L}_{5}⇋PC{L}_{3}+C{L}_{2}$ is 0.0205 at 230°C and 1 atmospheric pressure if at equilibrium concentration of $PC{L}_{5}$is 0.235 moles $lite{r}^{-1}$and that of $C{L}_{2}$= 0.028 moles$li{t}^{-1}$ then conc. of $PC{L}_{3}$ at equilibrium is

0.0174
0.174
0.0348
1.74