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BITSAT 2023Paper 1
Exam
BITSAT
Year
2023
Paper
Paper 1
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

BITSAT 2023 · Paper 1 · Chemistry · p Block Elements (Group 13 & 14)

What is x in the following reaction? Al(s)+NaOH(aq)+H_2 O(l) arrow...

What is xx in the following reaction?
Al(s)+NaOH(aq)+H2O(l)→x+H2( g)\mathrm{Al}(\mathrm{s})+\mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow x+\mathrm{H}_2(\mathrm{~g})

Options

  1. A\mathrm{Na}_2[Al(OH)4]−\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}
  2. B\mathrm{Na}^{+}[Al(OH)4]−\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}
  3. C\mathrm{Na}_2[Al(OH)6]−\left[\mathrm{Al}(\mathrm{OH})_6\right]^{-}
  4. D\mathrm{Na}^{+}[Al(OH)6]−\left[\mathrm{Al}(\mathrm{OH})_6\right]^{-}

Correct answer

B. \mathrm{Na}^{+}[Al(OH)4]−\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}

Step-by-step solution

2Al(s)+2NaOH(aq)+6H2O(l)→2 \mathrm{Al}(\mathrm{s})+2 \mathrm{NaOH}(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow 2Na+[Al(OH)4]−(aq)+3H2( g)2 \mathrm{Na}^{+}\left[\mathrm{Al}(\mathrm{OH})_4\right]^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})
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