Mg metal burns in air to give a white ash. When this ash is treated with water, sometimes the odour of ammonia can be detected, because of:

M g_{3} N_{2}

formation

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M g (O H)_{2}

formation

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M g O

formation

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M g_{2} N_{3}

formation

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Solution

The correct option is B $M g_{3} N_{2}$ formation
When Mg burns in air, it reacts with oxygen as well as nitrogen to form magnesium oxide and nitride respectively.
$M g + O_{2} \to M g O$
$3 M g + N_{2} \to M g_{3} N_{2}$
When magnesium nitride is treated with water, it gives ammonia. Thus we get the odour of ammonia.
$M g_{3} N_{2} \to M g O + N H_{3}$

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M g_{3} N_{2}

M g_{3} N_{2}

N H_{3}

2 M g + O_{2} \to 2 M g O

3 M g + N_{2} \to M g_{3} N_{2}

M g_{3} N_{2} + 6 H_{2} O \to 3 M g (O H)_{2} + 2 N H_{3} ↑

A g N O_{3}

(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water ?

(b) Name the other ion formed when ammonia dissolves in water.

Explain the formation of scum when hard water is treated with soap.

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