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ICSE Class 10 Chemistry Question 15 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 8

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Question

Question 4(iv)

The following questions are pertaining to the laboratory preparation of Ammonia gas from Magnesium nitride:

(a) Write a balanced chemical equation for its preparation.

(b) Why is this method seldom used?

(c) How do you identify the gas formed?

Answer

(a) Mg3N2 + 6H2O ⟶ 3Mg(OH)2 + 2NH3

(b) As nitrides are expensive, hence the method is seldom used.

(c) Ways in which ammonia gas can be identified is:

  1. It has a sharp characteristic odour.
  2. It turns:
    1. moist red litmus blue,
    2. moist turmeric paper brown,
    3. phenolphthalein solution pink.
  3. When a glass rod dipped in conc. HCl is brought near the mouth of the jar containing NH3, dense white fumes of ammonium chloride are formed.
    NH3 + HCl ⟶ NH4Cl