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Q.

Some pale-green crystals are strongly heated. The gases given off are passed into a container surrounded by ice and then through a solution of acidified KMnO4. The KMnO4 is decolorised, a waxy white solid is formed in the ice container; this is dissolved in water. The solution will

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a

Give a precipitate with silver nitrate solution

b

Give a precipitate with barium chloride solution

c

Turn red litmus blue

d

Give blue colour with starch solution

answer is B.

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Detailed Solution

Assume green crystal of FeSO4FeSO4⟶ΔFe2O3+SO2+SO3SO2+MnO4Θ⟶Mn2++SO42−SO3 forms waxy white solid (H2SO4) in ice container which is dissolved in water and gives SO42− ion. When BaCl2 reacts withSO42− ion, it forms white ppt. of BaSO4.
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