1(iii)
The electronic configuration of an element is 2,8,2. The hydroxide of this element can produce ............... hydroxyl ions per molecule.
- (a)3
- (b)2
- (c)1
- (d)0
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2
Reason — An element with electronic configuration 2, 8, 2 is magnesium (Mg) with valency 2. Its hydroxide is Mg(OH)2, which contains 2 hydroxyl (OH-) ions per molecule.
Mg(OH)2 ⟶ Mg2+ + 2OH-