Q 2719223119.     Consider the following reactions:
(i) `H^(+)_(aq) + OH^-(aq) = H_2O_(l),`
` Delta H = -X_1 kJ mol^(-1)`
(ii) `H_(2(g)) + 1//20_(2(g)) = H_2O_(l),`
` Delta H = -X_2 kJ mol^(-1)`
(iii) `CO_(2(g)) + H_(2(g)) = CO_(g) + H_2O_(l),`
`Delta H = -X_3 kJ mol^(-1)`
(iv) `C_2H_(2(g)) + 5//2O_(2(g)) = 2CO_(2(g)) + H_2O_(l),`
`Delta H = +X_4 kJ mol^(-1)`.
Enthalpy of formation of `H_2O_(l)` is

AIPMT 2007
A

`+X_3 kJ moJ^(-1)`

B

`- X_4 kJ moJ^(-1)`

C

`+X_1 kJ moJ^(-1)`

D

`-X_2 kJ moJ^(-1)`

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