Two reactions are given below :
(i) `CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g))`
(ii) `Ag_(2)O_((s)) rarr 2Ag_((s))+(1)/(2)O_(2(g))`
Which of the following statements is true ?

Options

A. For (i) `DeltaH lt DeltaU` and for (ii) `DeltaH gt DeltaU`
B. For (i) `DeltaH gt DeltaU` and for (ii) `DeltaH lt DeltaU`
C. For both (i) and (ii) `DeltaH gt DeltaU`
D. For both (i) and (ii) `DeltaH lt DeltaU`

Answer

A

Explanation

For (i) `Deltan_(g)=1-(3)/(2)=-(1)/(2)`
For (ii) `Deltan_(g)=(1)/(2)-0=(1)/(2)`