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Q.

$N_{2_{(g)}} + 2 O_{2_{(g)}} \to 2 {NO}_{2} + XKJ$
$2 {NO}_{_{(g)}} + O_{2_{(g)}} \to 2 {NO}_{2_{(g)}} + YKJ$
The enthalpy of formation of $NO$ is

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a

$(2 X - 2 Y)$

b

$X - Y$

c

$1 / 2 (Y - X)$

d

$1 / 2 (X - Y)$

answer is C.

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Detailed Solution

$\frac{1}{2} N_{2} + O_{2} \to N O_{2}, Δ H^{} = \frac{- x}{2} k J$

$N O_{2} \to N O + \frac{1}{2} O_{2}, Δ H = \frac{+ y}{2}$

$\frac{1}{2} N_{2} + \frac{1}{2} O_{2} \to N O, Δ H = \frac{y}{2} - \frac{x}{2}$

$= \frac{1}{2} [y - x]$

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