p-Block elementsHard

Question

Which is true statement ?

Options

A.Sulphur trioxide exist as cyclic trimer, S3O9 in solid state.
B.Selenium trioxide solid is a cyclic tetramer, Se4O12
C.SO2 turns starch iodate paper blue.
D.All are correct

Solution

(A) and (B) are correct statements.
(C) 2KIO3 + 5SO2 + 4H2O  →  K2SO4 + 4H2SO4 + I2
Iodine liberated forms blue coloured adsorption complex with starch.

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