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An Intiative by Sri Chaitanya
a
A filter paper moistened with cadmium acetate solution turns yellow, when brought in content with H2S gas.
b
Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury(II) chloride.
c
Sulphites in presence of zinc, reacts with dilute H2SO4 to liberate SO3 gas.
d
A filter paper moistened with KIO3 and starchturns blue in contact with SO2 vapours.
answer is B.
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