Consider the following statements ( a ) The pH of a mixture containing 400   m L of 0.1   M  …

Consider the following statements
(a) The pH of a mixture containing 400 mL of 0.1 M H2SO4 and 400 mL of 0.1 M NaOH will be approximately 1.3.
(b) Ionic product of water is temperature dependent.
(c) A monobasic acid with Ka=10-5 has a pH=5 . The degree of dissociation of this acid is 50% .
(d) The Le Chatelier's principle is not applicable to common-ion effect.
The correct statements are:
  1. (b)  and  (c)
  2. (a), (b)  and  (d)
  3. (a)  and  (b)
  4. (a), (b)  and  (c)

Solution

Strong acid + Strong base mixture
n H2SO4>n[NaOH] So H+ will be more
H+=2×0.1×400-0.1×400800=0.05
pH=-log⁡H+=-log⁡0.05=1.3
(b) The ionic product of water is temperature dependent
(c) HCOOH⇌H++HCOO- (weak acid)
ka=Cα21-α
ka=Cα.α1-α
ka=H+α1-α
10-5=10-5×α1-α
1-α=α
α=12=0.5
(d) Le-Chatelier’s Principle in applicable on Common Ion Effect

Asked in: JEE Main 2019 (10 Apr Shift 1)

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