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Q.

When an inorganic compound reacts with SO2, in aqueous medium produces (A). (A) on reaction with Na2CO3, givesthe compound (B) which with Sulphur gives a substance (C) used in photography. The compound (C) is

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a

Na2S2O3

b

Na2SO4

c

Na2S

d

Na2S2O7,

answer is A.

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Detailed Solution

Inorganic compound + SO2, in aq. medium →(A) (A) +Na2CO3⟶ (B)  (B) +S⟶(C) (Used in photography) Na2CO3+2SO2+H2O⟶2NaHSO4+CO22NaHSO4+Na2CO3⟶2Na2SO3+H2O+CO2Na2SO3+S⟶Na2S2O3                         (C)
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