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By passing chlorine gas through a colour...

By passing chlorine gas through a colourless solụtion, we get bleaching powder.
(a) What happens if `CO_2` is passed instead of `Cl_2` ?
(b) When `CO_2` is passed in excess, what changes can you observe?

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(a) The product is .CaCO_3.
(b) When .CO_2. is passed in excess, .Ca(HC O_3)_2. is formed.
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