4. (a) How will you show that ammonia contains nitrogen and hydrogen?

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Solution

$N_{2} (g) + 3 H_{2} (g) ⇄_{450 - 500 ° C}^{Fe / Mo} 2 {NH}_{3} (g) + Heat$
This is a reversible and exothermic process. Ammonia comprises nitrogen and hydrogen, as shown by the above reaction.
Also,
$4 {NH}_{3} + 3 O_{2} \overset{Heat}{\to} 2 N_{2} ↑ + 6 H_{2} O ↑$
The flame of ammonia is yellowish. It emits nitrogen and water vapour. Ammonia includes both nitrogen and hydrogen, as evidenced by this.

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