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Hydrogen is evolved by the action of col...

Hydrogen is evolved by the action of cold dil. `HNO_3`, on

A

`Fe`

B

`Mn`

C

`Cu`

D

`Al`

Text Solution

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The correct Answer is:
2
`(1)4Fe+underset("very dil.")(10HNO_(3))rarr4Fe(NO_(3))_(2)+NH_(4)NO_(3)+3H_(2)O`
`4Fe+underset("dil.")(10HNO_(3))rarr4Fe(NO_(3))_(2)+N_(2)O+5H_(2)O`
`(2)Mn+underset("dil.")(2HNO_(3))rarrMn(NO_(3))_(2)+H_(2)`
`(3)3Cu+underset("dil.")(8HNO_(3))rarr3Cu(NO_(3))_(2)+2NO+4H_(2)O`
`(4)2Al+8HNO_(3)rarr2Al(NO_(3))_(2)+2NO+4H_(2)O`
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