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If enthalpy of overall reaction XrarrY a...

If enthalpy of overall reaction `XrarrY` along one route is `Delta_(r)H and Delta_(r)H_(1),Delta_(r)H_(2),Delta_(r)H_(3)`…. Representing enthalpies of reactions leading to same product Y then `Delta_(r)H` is

A

`Delta_(r)H=Delta_(r)H_(1)+Delta_(r)H_(2)+Delta_(r)H_(3)…`

B

`Delta_(r)H=Delta_(r)H_(1)xxDelta_(r)H_(2)xxDelta_(r)H_(3)…`

C

`Delta_(r)H=Delta_(r)H_(1)+Delta_(r)H_(2)-Delta_(r)H_(3)…`

D

`Delta_(r)H=(Delta_(r)H_(1)xxDelta_(r)H_(2)xxDelta_(r)H_(3))/(2)…`

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The correct Answer is:
A
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The Delta_(r )H^@ (enthalpy of formation) is positive in :

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