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Q.

A student set - up the experiment below to find out what conditions were needed for rusting to occur.

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Why have calcium chloride and boiling water, be taken in test tubes B and C respectively ?

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a

To absorb oxygen and moisture respectively

b

To absorb oxygen and being rich is oxygen respectively

c

To absorb moisture and oxygen respectively

d

To absorb moisture and having no oxygen respectively 

answer is D.

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Detailed Solution

CaCl2 absorb moisture and no oxygen is present in hot water. Since The essential condition for rusting is moist air and oxygen. Hence Rusting is not observed in B and C. 

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A student set - up the experiment below to find out what conditions were needed for rusting to occur.Why have calcium chloride and boiling water, be taken in test tubes B and C respectively ?