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Barium sulphate on fusion charcoal and s...

Barium sulphate on fusion charcoal and sodium carbonate yields a compound `(X).(X)` on reaction with dilute HCl liberates a gas `(Y)`. The gas `(Y)` can be identified by `:`

A

blackening of filter paper moistened with lead acetate solution.

B

turning the filter paper yellow moistened with cadmium acetate solution.

C

turning the filter paper purple moistened with sodium nitroprusside made alkaline with ammonia solution

D

all of these

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