Question

For the reaction, $2 NO (g)+ O _{2}(g) \rightleftharpoons 2 NO _{2}(g),$ increase in pressure favours the formation of $NO _{2}$. The reaction is exothermic.

• A. If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
• B. If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
• C. If Assertion is true but Reason is false
• D. If both Assertion and Reason are false

Answer 1

Answer: (B)

If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion

Answer 2

$2 NO + O _{2} \rightleftharpoons 2 NO _{2}$ In this reaction, Number of moles of gaseous reactants, $n_{r}=3$ Number of moles of gaseous products, $n_{p}= 2$ Since, $n_{p}$ is less than $n_{r}$, according to Le-Chatelier principle, increase in pressure shifts the equilibrium in forward direction, ie, more $NO _{2}$ is formed. The reaction given above is exothermic.