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Question

1 mol BaF2 +2 mol H2SO4 resulting mixture, which will be neutralised by:

A
1 mol KOH
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B
2 mol Ca(OH)2
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C
2 mol NaOH
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D
2 mol KOH
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Solution

The correct option is B 2 mol Ca(OH)2
BaF2(1mol)+H2SO4(2mol)BaSO4+H2F2+H2SO4(unreacted)
1 2 1 1 1
Acid requires base for neutralisation according to the above reaction:
H2F2=2OH= 1 mol Ca(OH)2 or 2 mol KOH
HSO4=2OH= 1 mol Ca(OH)2 or 2 mol KOH
So, this solution will require total 2 mol Ca(OH)2 or 4 mol KOH for neutralisation.

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