Q16 / 100 · BITSAT 2023 (Memory Based Paper 1) · Chemistry

What is $x$ in the following reaction?
$\mathrm{Al}(\mathrm{s})+\mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow x+\mathrm{H}_2(\mathrm{~g})$

  • A
    $\mathrm{Na}_2\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}$
  • Correct answer
    B
    $\mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}$
  • C
    $\mathrm{Na}_2\left[\mathrm{Al}(\mathrm{OH})_6\right]^{-}$
  • D
    $\mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_6\right]^{-}$

Solution

$2 \mathrm{Al}(\mathrm{s})+2 \mathrm{NaOH}(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow$ $2 \mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})$

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

More p Block Elements (Group 13 & 14) Questions