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Zn gives hydrogen with H2SO4 and HCl but...

Zn gives hydrogen with `H_2SO_4` and HCl but not with `HNO_3` because

A

Zn act as oxidising agent when react with `HNO_(3)`

B

`HNO_(3)` is weaker acid than `H_(2)SO_(4)` and HCl

C

In electrochemical series `Zn` is placed above hydrogen

D

`NO_(3)^(-)` is reduced in preference to hydronium ion

Text Solution

Verified by Experts

The correct Answer is:
D
Zn have lower value of `E_("cell")^(@)` and easily gives oxidation. Zn is present above `H_(2)` in electrochemical series. So, it liberates hydrogen gas from dilu. `HCl//H_(2)SO_(4)`. But `HNO_(3)` is an oxidising agent. The hydrogen obtained in this reaction is converted into `H_(2)O` . In `HNO_(3), NO_(3)^(-)` ion is reduced and give `NH_(4)NO_(3), N_(2)O, NO` and `NO_(2)` (based upon the concentration of `HNO_(2)`).
`[Zn+underset(("Nearly"6%))(2HNO_(3)) rarr Zn(NO_(3))_(2)+2H]xx4`
`({:(HNO_(3)+8HrarrNH_(3)+3H_(2)O),(NH_(3)+HNO_(3)rarrNH_(4)NO_(3)):})/(4Zn+10HNO_(3)rarr4Zn(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O)`
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