Question

$2H_{2}S\left(g\right)+3O_2\left(g\right)\to 2S{O}_2\left(g\right)+2H_{2}O\left(g\right)+$ heat

Which quantity is increased when the volume of the system is decreasing ?
I. Rate of reaction
II. Equilibrium concentration of reactants
III. Value of $K_{eq}$

• A. I only
• B. III only
• C. I and II only
• D. II and III only
• E. I, II, and III

Answer 1

The correct option is A I only

When the volume of the reaction system is decreased, the rate of the reaction is increased.
The value of the equilibrium constant will remain unchanged and the equilibrium concentrations of reactants will decrease and products will increase.
With decrease in the volume, the number of moles of reactant per unit volume increases. This increases the reactant concentration and the rate of the reaction.