Some basic concepts of chemistry

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basic-chemistry-concepts
neutralization
finding-moles
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pp
#1

Please give answer of question 20

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#2

Is it (b) 1mol???

#3

I think the correct answer will be 1 mol because 1 mol of HCl is formed when Cl- of NH4Cl reacts with water,so we need additional 1 mol of HCl to neutralize this.
So,option b) is correct.

#4

I mole of nh4cl will react with 1 mole of Naoh,and remaining one mole of naoh will react with
1 mole of hcl