Which of the following pair of substances will not evolve `H_2` gas

Options

A. Iron and `H_(2)SO_(4)(` aqueous`)`
B. Iron and steam
C. Sodium and ethyl alcohol
D. Copper and `HCl(` aqueous `)`

Answer

d

Explanation

`Fe +dil. H_(2)SO_(4)rarr Fe SO_(4) + H_(2)`
`Fe+underset(Steam)(4H_(2)O) rarrFe_(3)O_(4)+4H_(2)`
`Cu+dil. HCl rarr `No reaction
Copper does not evolve `H_(2)` from acid as it is below hydrogen in electrochemical series.
`2Na+C_(2)H_(5)OH_(4)rarr 2H_(2)H_(5)ONa+H_(2)`