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Subject :NSO    Class : Class 7

The rain becomes acidic because W, sulphur dioxide and X dissolve in rain drops to form Y, Z and nitric acid respectively. W turns lime water milky. Identify W, X, Y and Z respectively.

A Carbon monoxide, Nitrogen, Calcium hydroxide, Sulphur
B Carbon monoxide, Nitrogen oxide, Carbon dioxide, Sulphuric acid
C Carbon dioxide, Nitrogen dioxide, Carbonic acid, Sulphuric acid
D Carbon dioxide, Nitrogen oxide, Calcium hydroxide, Sulphur.


Ans 1:

Class : Class 8

Ans 2:

Class : Class 10

Ans 3:

Class : Class 8

Ans 4:

Class : Class 8

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