Assertion : Δ H and Δ E are almost the same for the reaction, N_ 2(~g) +O_ 2(~g) leftharpoons 2 NO(g . Reason : All reactants and products are gases.

Correct answer: B. If both assertion and reason are true and the reason is not the correct explanation of the assertion Δ H=Δ E+Δ n R TΔ n= change in number of moles of products and reactant species. aligned & N_ 2(g) +O_ 2(g) leftharpoons2 NO_ (g) Δ n= & 2-2=0 Δ H= & Δ E+0 T or, =Δ E . aligned

AIIMS 2003

Exam: AIIMS
Year: 2003
Subject: Chemistry
Chapter: Thermodynamics (C)

AIIMS 2003 · Chemistry · Thermodynamics (C)

Assertion : Δ H and Δ E are almost the same for the reaction, N_...

Assertion :

\Delta H

and

\Delta E

are almost the same for the reaction,

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

. Reason : All reactants and products are gases.

Options

AIf both assertion and reason are true and the reason is the correct explanation of the assertion
BIf both assertion and reason are true and the reason is not the correct explanation of the assertion
CIf assertion is true but reason is false
DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true and the reason is not the correct explanation of the assertion

Step-by-step solution

\Delta H=\Delta E+\Delta n R T\Delta n=

change in number of moles of products and reactant species.

\begin{aligned}& \mathrm{N}_{2(g)}+\mathrm{O}_{2(g)} \rightleftharpoons2 \mathrm{NO}_{(g)}\\ \Delta n= & 2-2=0 \\ \Delta H= & \Delta E+0 \timesR T \text{ or, } \DeltaH=\Delta E . \end{aligned}

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