Question

The colour of the precipitate formed when barium chloride solution reacts with
sodium sulphate

Answer 1

The follows reaction takes place when barium chloride reacts with sodium sulphate:-
BaCl2 + Na2SO4= BaSO4 + NaCl

Here, BaSO4 is the precipitate whose colour is white.
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Answer 2

BaCl2 + Na2SO4 ⇒  BaSO4 +  2NaCl
the precipitate formed is white in colour