Question

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

Answer 1

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:
${\mathrm{BaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to \underset{\mathrm{White}\mathrm{precipitate}}{\mathrm{Ba}\left({\mathrm{SO}}_4{)}_2\right(\mathrm{s})}+\mathrm{NaCl}\left(\mathrm{aq}\right)$

Hence, the correct answer is option 3.