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Q.

Na2SO3+HCl→Na2SO4+H2O+X

X+Na2S→ΔS+Y; Y+I2⟶NaI+'Z'

‘Z’ is a salt of which oxy acid

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a

H2SO8

b

H2SO4

c

H2SO5

d

H2S4O6

answer is C.

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Detailed Solution

Na2SO3→HCldilNa2SO4+SO2(X)+H2O

3SO2+2Na2S(X)⟶S+2Na2S2O3(Y)

2Na2S2O3+I2(Y)⟶Na2S4O6+2NaI(Z)

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