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Question

Partial neutralisation of a polybasic acid gives

A
Acidic salt
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B
Basic salt
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C
Normal salt
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D
Double salt
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Solution

The correct option is A Acidic salt
A polybasic acid contains more than one replaceable H atoms. It can undergo either partial or complete ionisation in several steps i.e., one H+ ion is separated from the molecule at one time.
The salts which contain replaceable hydrogen atom(s) when released in the aqueous solvent are termed as acidic salts.
For example, NaOH+H2SO4NaHSO4+H2O, NaHSO4 is an acidic salt due to the presence of one replaceable H atom which can be further be replaced to give Na2SO4.

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