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Subject :NSO    Class : Class 7

Which of the following statements is correct?

AQuick lime or slaked lime is added to soil to neutralise the base present in it.
BAnt sting injects acetic acid into the skin hence, baking soda is used as a remedy.
CAll bases are alkalies but all alkalies are not bases.
DThe factory wastes are treated with calcium hydroxide to neutralise acids before the wastewater is disposed off.


Ans 1:

Class : Class 9
the answer is (d), as calcium hydroxide is a base and it neutralises the effect of the acids in wastewater

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