Question

Which combination do not produce $H_2$ except:-

• A. Au + cold water
• B. Cu + aq.$H_2{SO}_4$
• C. Pt + $dil.{HNO}_3$
• D. All of these

Answer 1

Answer: (D)

All of these

Because gold (Au) is the least reactive metal, even less than hydrogen, now as Hydrogen is more reactive, gold cannot displace it, hence water and gold will not react.

$Cu$ can't liberate $H_2$ from $H_{2}S{O}_4$ and same case with $Pt$ and $HN{O}_3$.

Hence option D is correct.