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Q.

When CuSO4 is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed, x and y respectively.

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a

x=Cu2I2        y=Na2S2O5

b

x=Cu2I2         y=Na2S4O6

c

x=CuI2         y=Na2S4O3

d

x=CuI2        y=Na2S4O6

answer is B.

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Detailed Solution

CuSO4+2KI CuI2Unstable+K2SO4               2CuI2 Cu2I2White+I2          KI+I2 KI3    Brown solution                  KI3+2Na2S2O3 KI+Na2S4O6+2NaI

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When CuSO4 is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed, x and y respectively.