An element "Z" of valency 2 forms its sulphate with chemical formula ZSO4. Find:
(i) the ions present in the compound.
(ii) the chemical formula of its nitride.
(iii) the chemical formula of its hydroxide.
[5 Marks]
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Solution
(i) Given that the chemical formula of the sulphate containing element "Z" is ZSO4 and the valency of Z is 2.
Thus, the ions present in the compound are: Z2+ and SO2−4
[1 Mark]
(ii) Valency of Z2+ = 2
Valency of nitride ion (N3−) = 3
Symbol
Z
N
Valency
2
3
Upon criss-crossing the valencies, we get Z3N2 as the chemical formula of the nitride of Z.
[2 Marks]
(iii) Valency of Z2+ = 2
Valency of hydroxide ion (OH−) = 1
Symbol
Z
OH
Valency
2
1
Upon criss-crossing the valencies, we get Z(OH)2 as the chemical formula of the hydroxide of Z.
[2 Marks]