Rahul poured clear solution of test-tube A and equal quantity of solution of Test-tube B in a conical flask. Shaked it well and kept undisturbed for sometime. After sometime white precipitates settled down below a clear solution in the flask. Rahul forgot to write the name of the solution in the test-tube A. What it can be

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Barium chloride

Sodium chloride

Sodium sulphate

Barium sulphate

answer is D.

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Detailed Solution

The solution in test tube A. is sodium sulphate.

The reaction taking place is

${Na}_{2} {SO}_{4} + {BaCl}_{2} \to NaCl + {BaSO}_{4} ↓$

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