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N2(g) + 2O2(g) →2NO2(g) + X kJ ; 2NO(g) + O2(g) →2NO2(g) + Y kJ ;then heat of formation of NO(g) is

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a

2X-2Y

b

X-Y

c

Y-X2

d

X-Y2

answer is C.

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Detailed Solution

N2g+2O2g→2NO2g:ΔH=−X kJ...1 ; 2NO2→2NO+O2..∆H=+YKJ....(2) ; 12N2+12O2→NO,∆H=? ; 12Eq1+12Eq2 ∆H = 12(Y-X)

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