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JEE · NEET Previous Year Question

$If Δ H is the change in enthalpy and Δ E, the change in internal energy accompanying a gaseous reaction, then$

Topic: NEET PYQ

Answer: D. Full step-by-step solution below.

A $Δ H is always greater than Δ E$
B $Δ H < Δ E only ifthe number of moles of the products is greater than the number of moles of the reactants$
C $Δ H is always less than Δ E$
D $Δ H < Δ E only if the number of moles of products is less than the number of moles of the reactants.$

Correct answer: D

Solution

(d) If n_{p} < n_{r}; Δ n_{g} = n_{p} - n_{r} = - ve . Hence Δ H < Δ E .

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