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ICSE Class 10 Chemistry Question 27 of 69

Study of Compounds — Ammonia — Question 12

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Question

Question 9

An element has 2 electrons in it's N shell. It reacts with a non-metal of atomic number 7. The compound formed reacts with warm water and produces a basic gas. Identify the elements and write the balanced chemical reactions.

Answer

An element has 2 electrons in it's N shell, hence, it has

  1. 2 (electrons in K shell) +
  2. 8 (electrons in L shell) +
  3. 8 (electrons in M shell) +
  4. 2 (electrons in N shell) = 20 electrons total i.e. Calcium

Non metal (atomic number 7) is Nitrogen

Calcium and Nitrogen react to form calcium nitride.

3Ca + N2 ⟶ Ca3N2

Ca3N2 reacts with water to give calcium hydroxide and ammonia.

Ca3N2 + 6H2O ⟶ 3Ca(OH)2 + 2NH3 [g]