p-Block elementsMediumBloom L3

Question

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

Options

A.Na2S
B.Na2S2O7
C.Na2SO4
D.Na2S2O3

Solution

Sol. Ca(OH)2​+Na2​CO3​→CaCO3​+2NaOH

6NaOH+4S→2Na2​S+Na2​S2​O3​+3H2​O

C is Na2​S2​O3​ which is used in photography.

A is Ca(OH)2​.

B is NaOH.

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