When the gas formed on heating limestone...

When the gas formed on heating limestone is passed through freshly prepared lime water, the lime water turns milky.

Text Solution

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(i) On heating, limestone undergoes thermal decomposition to form calcium oxide (quick lime) and carbon dioxide.
`CaCO_(3(s))overset(Delta)tounderset("quick lime")(CaO_((s)))+CO_(2)uarr`
(ii) Calcium oxide when dissolved in water forms Calcium hydroxide (lime water).
`CaO_((s))+H_(2)O_((l))to underset("Calcium hydroxide")(Ca(OH)_(2(aq)))`
(iii) When carbon dioxide is passed through lime water it turns milky due to formation of white precipitate of Calcium carbonate.
`Ca(OH)_(2(aq))+CO_(2(g))to underset("Calcium carbonate")(CaCO_(3(s)))+H_(2) O_((l))`

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________turns lime water milky.

`CO_(2)`

`O_(2)`

Nitrogen

Haemoglobin

Passing chlorine gas through dry slaked lime to produce …………………… .

`CaOCl`

`CaOCl_(2)`

`CaO`

`CaCl_(2)`

A chemical A is used for the preparation of washing soda. When CO_2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?

`Ca(HCO_3)_2`

CaO

`Ca(OH)_2`

`CaCO_3`