1.

Which of the following mixture solution has pH ~~ 1.0 ?

Answer»

100 ML of `(M)/(10)HCl +100` ml of `(M)/(10)` NAOH
55 ml of `(M)/(10)HCl+45` ml of `(M)/(10)` NaOH
10 ml of `(M)/(10)HCl+90`ml of `(M)/(10)` NaOH
75 ml of `(M)/(5)HCl+25` ml of `(M)/(5)` NaOH.

Solution :25 ml of M/5 NaOH will NEUTRALIZE 25 ml of M/5 HCl. The remaining 50 ml of M/5 will be equal to 100 ml of M/10 HCl.
`pH=-log[H^(+)]`
`=-log 10^(-1)=1`


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