Question

16- The valency of hydroxide ion is:

a) -1 b) -3 c) +2 d) +1​

Answer 1

Answer:

-1

Explanation:

Oxygen generally has a valency of -2, although there are exceptions, for example, hydrogen peroxide (H2O2) where it is -1.

Hydrogen generally has a valency of +1, except in metal hydrides, such as sodium hydride , (NaH)where it is -1.

If we add the valenciesod O & H, together we get:

(-2 ) + (+1) = -1.

Therefore the valency of the hydroxide ion, OH-, is -1, which you can note, is also the charge on the ion.

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Answer 2

Answer:

d)-1

Explanation:

Hydroxide is monovalent.

It has one O2 which is an anion and has charge of 2-, and hydrogen has one positive charge 1+.

O2 + H2 = (2-) + 1 = -1