If the heat of formation of NO2 is x \lbrack1/2N2+O2=NO .heat of reaction N2+O2=2NO is y and the heat of reaction 2NO+O2=2NO is z then (a)2x+z=y (b)2y+x=x (c)2x-z=y (d)2z+x=y

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N_{2} + O_{2} ⇋ 2 N O, K_{1}

\frac{1}{2} N_{2} + \frac{1}{2} O_{2} ⇋ N O, K_{2}

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N O ⇌ \frac{1}{2} N_{2} + \frac{1}{2} O_{2}, K_{4}

K_{1} \times K_{3} = x; \sqrt{(K_{1})} \times K_{4} = y; \sqrt{(K_{3})} \times K_{2} = z

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N_{2} + O_{2} ⇌ 2 N O

N_{2} + O_{2}

⇌

2 N O - H e a t

N_{2}

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N_{2} + O_{2} ⇌ 2 N O + H e a t

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