The colour of insoluble product formed when sodium sulphate solution and barium chloride solution are mixed together is :(1) blue (2) yellow(3) white (4) red-brown

Correct Answer: (3) white

Explanation: When barium chloride reacted with sodium sulphate solution then double displacement reaction occurs. A white precipitate of barium sulphate and the aqueous solution of sodium chloride is obtained. The reaction involves is as follows:

$BaCl_2(aq) + Na_2SO_4 (aq) → Ba(SO_4)_2 (s) + NaCl (aq)$