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Question

Observe the set up given below. Which option correctly describes the changes in lime water kept in test tubes B and C?

A
Lime water in B turns milky while in C no colour change is observed.
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B
Lime water in both B and C turn milky.
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C
Lime water in B does not change while that in C turns milky.
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D
Lime water kept in B and C does not change.
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Solution

The correct option is C Lime water in B does not change while that in C turns milky.
Potassium hydroxide solution absorbs the carbon dioxide present in air and hence lime water in B does not change colour.
Germinating seeds respire and hence release carbon dioxide in the air that turns the lime water in C milky.

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