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Question

Write the valencies of the following ions:
(a) Nitride ion
(b) Ammonium ion
(c) Hydrogen carbonate ion
[3 Marks]

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Solution

(a) The chemical formula of nitride ion is N3. It has -3 charge on it, thus its valency is 3.
[1 Mark]

(b) The chemical formula of ammonium ion is NH+4. It has +1 charge on it, thus its valency is 1.
[1 Mark]

(c) The chemical formula of hydrogen carbonate ion is HCO3. It has -1 charge on it, thus its valency is 1.
[1 Mark]

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