1.

A gas X turns line water milky. The milkiness disappears if excess of 'X' is passed. Milkiness reappears on heating the colourless solution. The gas is

Answer»

`CO_(2)`
`NO_(2)`
`NH_(3)`
`SO_(2)`

SOLUTION :`Ca(OH)_(2)+CO_(2) to CaCO_(3)underset("Excess") overset(CO_(2))to Ca(HCO_(3))_(2)`
`Ca(OH)_(2)+SO_(2) tounderset("Milky white")(CaSO_(3)) underset("Excess "H_(2)O) overset(SO_(2))to Ca(HSO_(3))_(2)`


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