MolSynapsequestion bank

MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

JEE Main levelSingle correct optionDifficulty 2 of 3pn079

When sulphur dioxide is passed through acidified potassium dichromate solution, the colour changes from

Ayellow to colourless
Borange to green
Corange to blue
Dgreen to orange

Answer: B

Cr X_{2} O X_{7} X^{2 -} + 3 SO X_{2} + 2 H X^{+} 2 Cr X^{3 +} + 3 SO X_{4} X^{2 -} + H X_{2} O

.

SO X_{2}

is oxidised to sulphate and orange dichromate is reduced to green

Cr X^{3 +}

.

Practice p-Block Elements: Groups 15 and 16 More on Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

Previous questionNext question

More questions on Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur