1.

Zn gives H_(2) gas with H_(2)SO_(4) and HCl but not with HNO_(3) because

Answer»

`Zn` acts as oxidizing agent when REACTS with `HNO_(3)`
`HNO_(3)` is WEAKER acid than `H_(2)SO_(4)` and HCl
In electrochemical series, Zn is above hydrogen
`NO_(3)^(-)` is REDUCED in PREFERENCE to hydronium ion

Solution :In the given reaction, `I^(-)` has been oxidized to `I_(2)` and `Cr_(2)O_(7)^(2-)` ions have been reduced to `Cr^(3+)`
`thereforeE_(cell)^(@)=E_(Cr_(2)O_(7)^(2-))^(@)-E_(I_(2))^(@)`
i.e., `0.79=1.33-E_(I_(2))^(@)` or `E_(I_(2))^(@)=0.54V`


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