The diagram above. Y is
A.
fused CaO
B.
H2O
C.
NaOH
D.
Concentrated H2SO4
Correct answer is D
In the preparation of sulphur dioxide by the action of dilute acids on sulphates and bisulphites. conc H2SO4 helps to release SO2 from the mixture.
The setup represents the production of sulphur dioxide