Question

Assertion (A): For the reaction, $2{NO}_{\left(g\right)}+O_{2\left(g\right)}\rightleftharpoons 2{NO}_{2\left(g\right)}$, increase in pressure favours the formation of ${NO}_2$

Reason (R): The reaction is exothermic.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true and R is not correct explanation of A
• C. A is correct and R is incorrect
• D. A is incorrect and R is correct.

Answer 1

The correct option is B Both A and R are true and R is not correct explanation of A

$2NO+O_2\rightleftharpoons 2N{O}_2$

$\Delta n_{gas}=2-1-2=(-1)$

$\Delta n_{gas}<0$

increase in pressure takes reaction forward as volume dec.

$R\to$ it is combustion reaction, so it is exothermic but doest not explains $A$.