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Stoichiometric Calculations

What is the v...

Question

What is the valency of?
h) Magnesium in $M g_{3} N_{2}$

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Solution

The valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

In $M g_{3} N_{2}$ , Magnesium nitride is formed when three molecules of magnesium combine with two molecules of nitrogen.

Hence, the valency of magnesium in $M g_{3} N_{2}$ is 2.

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Q. Assertion :Magnesium metal burns in air to give a white ash.When this ash is treated with water, the odour of ammonia can be detected. Reason: Mg burns in air to form MgO and

M g_{3} N_{2}

M g_{3} N_{2}

which on hydrolysis gives

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} ↑

Q. (a) Define the term valency.
(b) What is the valency for magnesium and aluminium?

Q. What is the valency of magnesium with atomic number

12

?

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Stoichiometric Calculations

Standard XII Chemistry

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