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COMEDK2015Chemistryp Block Elements (Group 15, 16, 17 & 18)

Which of the following chemicals does not liberate hydrogen gas on reaction with aluminium metal?

Options

  1. ADil. sulphuric acid
  2. BAqueous sodium hydroxide
  3. CDil. hydrochloric acid
  4. DConc. nitric acid

Correct answer

D. Conc. nitric acid

Step-by-step solution

Dil. and conc. HNO ₃ has no effect on Al . Aluminium is rendered passive by nitric acid due to the formation of a thin film of oxide ( Al ₂ O ₃ ) on its surface. 2 Al +6 HNO ₃ (conc.) Al ₂ O ₃+6 NO ₂+3 H ₂ O Aluminium reacts with H ₂ SO ₄ to libreate H ₂ gas. 2 Al +3 H ₂ SO ₄ Al ₂ ( SO ₄ )₃+3 H ₂ Aluminium also reacts with aqueous alkali and liberates dihydrogen. 2 Al (s)+2 NaOH (a q)+6 H ₂ O (l) 2 Na [ Al ( OH )₄ ](a q)+3 H ₂(g) Aluminium dissolves in dil. HCl and liberates dihydrogen. 2 Al (s)+6 HCl (a q) 2 Al ³⁺

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