Q.

Which gas turns lime water, a saturated solution of Ca(OH)2, cloudy?

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a

O2

b

H2

c

CH4

d

CO2

answer is C.

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Detailed Solution

Carbon dioxide gas from a cylinder is bubbled through limewater and calcium carbonate solid is formed causing the limewater to become cloudy.

Ca(OH)2+CO2CaCO3(Milky)

The correct option is B.

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