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Q.

SO2 gas is passed into lime water. Which of the following does not take place.

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a

If excess SO2 is passed milkyness disappears due to formation of soluble Ca(HSO3)2

b

In the beginning, lime water turns milky due to formation of insoluble CaSO3

c

On boiling the solution obtained by passing excess SO2, its milkyness reappears due to decomposition of Ca(HSO3)2 to CaSO3

d

Crystallization from the solution obtained by passing excess SO2 forms solid CaS2O5

answer is C.

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Detailed Solution

Ca(OH)2lime water+SO2H2O+CaSO3( milky )
CaSO3milkyness+H2O+SO2CaHSO3Colorless solution
CaHSO32ΔCaS2O5s+H2O
Bisulphites convert into pyrosulphites during crystallization.

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