Q43 / 180 · KCET 2020 · Chemistry

The metal that produce $\mathrm{H}_{2}$ with both dil. $\mathrm{HCl}$ and $\mathrm{NaOH}(a q)$ is

  • Correct answer
    A
    $\mathrm{Zn}$
  • B
    Mg
  • C
    $\mathrm{Ca}$
  • D
    $\mathrm{Fe}$

Solution

$\mathrm{Zn}+2 \mathrm{HCl}$ (dil.) $\longrightarrow \mathrm{ZnCl}_{2}+\mathrm{H}_{2}$ $\mathrm{Zn}+2 \mathrm{NaOH}+2 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]+\mathrm{H}_{2}$ But, Mg, Ca and Fe do not produce hydrogen, when react with aqueous $\mathrm{NaOH}$.

Hence, the correct answer is option: 'A'.

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