An imaginary reaction `X rarr Y` takes place in three steps
`X rarr A, DeltaH=-q_(1), " "BrarrA, DeltaH=-q_(2), " "BrarrY, DeltaH=-q_(3)`
If Hess's law is applicable, then the heat of the reaction `(X rarr Y)` is :

Options

A. `q_(1)-q_(2)+q_(3)`
B. `q_(2)-q_(3)-q_(1)`
C. `q_(1)-q_(2)-q_(3)`
D. `q_(3)-q_(2)-q_(1)`

Answer

B

Explanation

`XrarrA+q_(1)`
`q_(2)+ArarrB`
`BrarrY+q_(3)`
`q_(2)+XrarrY+q_(1)+q_(3), " "DeltaH=q_(2)-q_(1)-q_(3)`