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?

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Solution

When dil. Sulphuric acid is added to sodium carbonate and heated, a colourless, odourless gas is evolved. This gas is $C O_{2}$ . When $C O_{2}$ 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 $K_{2} C r_{2} O_{7}$ solution.

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