What happens when SO 2 gas is passed through a potassium dichromate solution-A- Colour changes from red to violetB- White precipitate formsC- Colour changes from orange to greenD- Solution is decolourised

The correct option is C Colour changes from orange to green When SO2 gas is passed through potassium dichromate solution, the colour of potassium dichromate ch ...

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Standard X

Chemistry

Test for Sulphuric Acid

What happens ...

Question

What happens when SO₂ gas is passed through a potassium dichromate solution?

Colour changes from orange to green

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White precipitate forms

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Solution is decolourised

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Colour changes from red to violet

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Solution

The correct option is A
Colour changes from orange to green

When SO₂gas is passed through potassium dichromate solution, the colour of potassium dichromate changes from orange to green (chromium sulphate). This is the potassium dichromate test for sulphuric acid.

2 K₂Cr₂O₇ + 8H₂SO₄ → 2 K₂SO₄ + 2 Cr₂(SO₄)₃ + 8 H₂O + 3O₂

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What happens when SO2 gas is passed through a potassium dichromate solution?

What happens when SO₂ gas is passed through a potassium dichromate solution?