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When air is blown from mouth into a test...

When air is blown from mouth into a test - tube containing lime water, the lime water turned milky due to the presence of

A

oxygen

B

carbon dioxide

C

nitrogen

D

water vapour

Text Solution

Verified by Experts

The correct Answer is:
B
Carbon dioxide reacts whit limewater to from calcium carbonated. Insoluble calcium carbonate is responsible for appearance of milky colour.
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Assertion (A) : When we blow into a test - tube containing lime water ,it turns milky Reason (R ) : This shows the presence of CO_(2) in the exhaled air .

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OSWAL PUBLICATION-LIFE PROCESSES- NCERT EXEMPLAR (MULTIPLE CHOICE QUESTIONS)
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