1.

Delta_(r) H of which of the following reactions is zero ?

Answer»

`H_(2) (G) + 2 H^(+) (g) + 2E^(-)`
`2 H(g) + AQ to 2 H^(+) aq + 2e^(-)`
`2 H (g) to 2 H^(+) (g) + 2e^(-)`
`H_(2) (g) + aq to 2 H^(+) (aq) + 2e^(-)`

Answer :D


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