Question

A chloride which forms a precipitate that is soluble in excess of sodium hydroxide is :

Copper chloride.
Calcium chloride.
Zinc chloride.
Magnesium chloride.

Answer 1

Answer:

Copper Chloride.

Explanation:

A chloride which forms a precipitate that is soluble in excess of Sodium Hydroxide is Copper Chloride.

Answer 2

Zinc Chloride is the correct answer

Copper Chloride

Initially it forms a blue precipitate of Cu(OH)2 which is a blue precipitate , upon reaction with excess base it forms a complex Cu(OH)4Cl2 which is partially soluble in the base

Calcium Chloride

Initially it forms a white precipitate of Ca(OH)2 , it doesn't react with excess NaOH

Zinc Chloride

Initially it forms a white precipitate of Zn(OH)2 , it is amphoteric and reacts with excess NaOH to form Na2(ZnO2), which is soluble

Magnesium Chloride

Initially it forms a white precipitate of Mg(OH)2 which doesn't react with excess NaOH