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(i). For a weak monobasic acid K(a)=10^(...

(i). For a weak monobasic acid `K_(a)=10^(_5)` and `pH=5` then degree of dissociation of acid is `50%`
(ii). `[H_(2)SO_(4)]=0.1M" "V=400ml`
`[NaOH]=0.1M" "V=400ml`
on mixing these solution pH is approximately 1.3
(iii). Ionic product of water depends on temeprature
(iv). Le-chatelier's principal is not applicable for common ion effect.
Select the correct options:

A

(B) and (C )

B

(A) and (B)

C

(A), (B) and (D)

D

(A), (B) and (C )

Text Solution

Verified by Experts

The correct Answer is:
D
(a) milimoles of `H^(+)=0.1xx400xx2=80`
millimoles of `OH^(-)=0.1xx400=40`
`[H^(+)]=(40)/(800)=(1)/(20)=5xx10^(-2)pH=1.3`
(b) Ionic product of water `(K_(w))` increases with increase in temperature.
(c) `K_(a)=10^(-5) [H^(+)]=10^(-5)M=Calpha`
`K_(a)=(Calpha^(2))/((1-alpha))=(Calpha.alpha)/(1-alpha)`
`10^(-5)=10^(-5).(alpha)/((1-alpha)) alpha=(1)/(2)(50%)`
(d) Le- Chatelier principle is applicable for common ion effect.
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