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A gas 'X' turns lime water milky. The mi...

A gas 'X' turns lime water milky. The milkiness dissappears if excees of 'X' is passed. Milkiness appears on heating the colourless solution then 'X' is:

A

`NO_(2)`

B

`CO_(2) `

C

`H_(2)S`

D

`NH_(3)`

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The correct Answer is:
B
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