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Given : `S_((s))+(3)/(2)O_(2(g))rarrSO_(3(g)+2X Kcal` `SO_(2(s))+(1)/(2)O_(2(g))rarrSO_(3(g)+Y Kcal` The heat of formation of `SO_(2)` is `:-`A. (2x + y)B. `-(2x - y)`C. x + yD. 2x / y

Answer» Correct Answer - B
(i) `S_((s))+(3)/(2)O_(2(g))rarr SO_(3(g)) , Delta H=-2x KCal`
(ii) `SO_(2(g))+(1)/(2)O_(2)(g)rarr SO_(2(g)) , Delta H = -y KCal`
`S_((s))+O_(2(g))rarr SO_(2(g)) , Delta H_(f) = ?`
Desired equation = eq(i)-eq(ii)
`Delta H_(f)=-2x-(-y)=(-2x-y)`


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