Question

An element M has valency 2. Write the formula of its hydroxide and nitride.

Answer 1

Formula of Nitride-M3N2 and formula of hydroxide-MH2O

Answer 2

The formula of hydroxide and nitride of this element are $M(OH)_2$ and $M_3N_2$

Explanation:

The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  For formation of a neutral ionic compound, the charges on cation and anion must be balanced.

The element M is having a valency ad oxidation state of 2 called as $M^{2+}$ cation and hydroxide is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $M(OH)_2$

The element M is having a valency ad oxidation state of 2 called as $M^{2+}$ cation and $N^{3-}$ is an anion with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $M_3N_2$

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