A colourless, odourless gas is evolved when a salt is treated with dilute H2SO4 and it turns lime water milky. The gas is

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A colourless, odourless gas is evolved when a salt is treated with dilute $H X_{2} SO X_{4}$ and it turns lime water milky. The gas is

Carbonates and hydrogencarbonates liberate

CO X_{2}

with dilute acid.

CO X_{2}

is colourless and odourless and gives milky

CaCO X_{3}

with lime water.

SO X_{2}

is also milky but pungent,

H X_{2} S

smells of rotten eggs and

NO X_{2}

is brown, so the gas is

CO X_{2}