Same chapter3 marksDifficulty: Medium
State three tests by which ammonia gas can be identified.
Study of Compounds: Ammonia
3 marksDifficulty: Medium
Write the equation for the laboratory preparation of ammonia from ammonium chloride and state why calcium hydroxide is used.
Original Khojo Papers practice question — not from a past board paper.
Answer
2NH4Cl + Ca(OH)2 → CaCl2 + 2NH3 + 2H2O. Calcium hydroxide is used because it is a cheap alkali that is not deliquescent and does not make the mixture pasty as sodium hydroxide would.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The mixture is heated in a hard glass tube sloping downwards so that the water formed runs away from the hot part.
Related questions
From the same topic and chapter, at a similar level.
Same chapter2 marksDifficulty: Medium
Why is ammonia highly soluble in water?
Study of Compounds: Ammonia
Same chapter3 marksDifficulty: Medium
Describe the Haber process for the manufacture of ammonia, giving the equation and the conditions.
Study of Compounds: Ammonia
Same chapter3 marksDifficulty: Medium
Why is ammonia dried over quicklime and not over concentrated sulphuric acid or phosphorus pentoxide?
Study of Compounds: Ammonia
Same chapter3 marksDifficulty: Medium
Why is aqueous ammonia a weak base while sodium hydroxide is a strong base?
Study of Compounds: Ammonia
Same chapter3 marksDifficulty: Medium
Write the equation for the catalytic oxidation of ammonia and name the industrial process in which it is the first step.
Study of Compounds: Ammonia