Question

# A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution.Identify the anion present in the compound?

Solution

## When dil. Sulphuric acid is added to sodium carbonate and heated, a colourless, odourless gas is evolved. This gas is $$CO_2$$. When $$CO_2$$ is passed through lime water, it turns like water milky due to the formation of calcium carbonate. Also this gas doesn't show any effect when passed through $$K_2Cr_2O_7$$ solution.Chemistry

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