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If `C(s)+O_(2)(g)to CO_(2)(g),DeltaH=rand CO(g)+1/2O_(2)to CO_(2)(g),DeltaH=s` then, the heat of formation of CO isA. `-Y-X`B. `Y-X`C. `X+Y`D. X -Y` |
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Answer» Correct Answer - B `C(s) + O_(2) (g) to CO_(2) (g), Delta H_(1) = - x` …(i) `CO (g) + (1)/(2) O_(2) (g) to CO_(2) (g), Delta H_(2) = - y` ….(ii) For the formation of CO subtract Eqs. (ii) from (i) i.e. `C(s) + O_(2) (g) to CO_(2) (g)` `underline(underset((-))(CO(g) + (1)/(2) underset((-))(O_(2) (g)) to underset((-))(CO_(2)(g)))` `underline(C(s) + (1)/(2) O_(2) (g) to CO (g))` `:. Delta_(r ) H` for formation of `CO = Delta H_(1) - Delta H_(2)` = - x + y or y - x |
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