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Which one of the following pairs of subs...

Which one of the following pairs of substances on reaction will not not evolve `H_2` gas?

A

Iron and `H_(2)SO_(4)(aq)`

B

Iron and steam

C

Copper and `HCl(aq)`

D

Sodium and ethyl alcohol

Text Solution

Verified by Experts

The correct Answer is:
C
( c) Since copper is placed below hydrogen in the electrochemical series, thus copper does not give hydrogen with dilute acids. While all other pairs give hydrogen on reaction.
`Fe+ dil. H_(2)SO_(4) to FeSO_(4) + H_(2) uarr`
`3Fe+underset("Steam")(4H_(2)O) to Fe_(3)O_(4) +4H_(2)uarr`
`2Na+C_(2)H_(5)OH to 2C_(2)H_(5)ONa+H_(2)uarr`
`Cu+ dil. HCl to` No reaction
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