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Question
The formula of the nitride of a metal X is XN, state the formula of its hydroxide.
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Solution
The formula of nitride of metal X is XN.
Since valency of nitrogen is 3-.
∴ Valency of X is 3+.
The hydroxide of metal X:
`"X"^(3+) ["OH"]^-1` = 
= `"X"_1["OH"]_3 = "X[OH]"_3`
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