Question

Assertion : $\Delta H$ and $\Delta E$ are almost the same for the reaction, $N _{2(g)}+ O _{2(g)} \rightleftharpoons 2 NO _{(g)}$
Reason : All reactants and products are gases.

• 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 and 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)

$\Delta H =\Delta E +\Delta nRT$

$\Delta n=$ change in number of moles of products and reactant species.

$N _{2( g )}+ O _{2( g )} \rightleftharpoons 2 NO _{( g )}$

$\Delta n=2-2=0$

$\Delta H =\Delta E + O \times RT$ or, $\Delta H =\Delta E$.