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Question

The valency of calcium in calcium hydroxide is ____.

A
+1
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B
+2
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C
-1
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D
-2
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Solution

The correct option is B +2
Calcium hydroxide = Ca(OH)2

Each OH ion has one net negative charge as oxygen has a valency of -2 and hydrogen has a valency of +1.

Now, as calcium hydroxide is a neutral compound, so it is possible only when calcium has a net positive charge of +2.

So, the valency of calcium in Ca(OH)2 is 2.
Also, Ca(OH)2 Ca2++2OH

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