Which compound is insoluble in water?

A) calcium bromide
B) potassium bromide
C) silver bromide
D) sodium bromide

Answer:

C) silver bromide

Explanation:

Calcium bromide is incorrect.

The compound which is insoluble in water is silver bromide (AgBr).

Those compounds which have high attraction force between their constitutes ions as compare to ions between the water and compounds are insoluble in water.

Among given compounds all are soluble in water except silver bromide, because silver is having high nuclear charge than other given alkali metals as calcium, potassium and sodium. So it tightly attracts the bromide ion towards itself and this attraction is more than the attraction between the H⁺ ion of water and bromide ion, as a result of which it is insoluble in water.

Hence, option (C) is correct i.e. silver bromide.

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