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If x(1) , x(2) and x(3) are enthalpies o...

If `x_(1)` , `x_(2)` and `x_(3)` are enthalpies of `H-H` , `O=O` and `O-H` bonds respective, and `x_(4)` is the enthaply of vaporisation of water, estimate the standard enthalpy opf combustion of hydrogen.

A

`x_(1)+(x_(2))/(2)-2x_(3)+x_(4)`

B

`x_(1)+(x_(2))/(2)-2x_(3)-x_(4)`

C

`x_(1)+(x_(2))/(2)-x_(3)+x_(4)`

D

`2x_(3)-x_(1)-(x_(2))/(2)-x_(4)`

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The correct Answer is:
b
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