JEE Main 2019ChemistryIonic EquilibriumPh Buffer And IndicatorsmediumMCQ
JEE Main 2019 — Ionic Equilibrium Question with Solution
From: JEE Main 2019 (Online) 10th April Morning Slot
Question
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 pH = 5. The degree of dissociation of this acid is 50 %.
(d) The Le Chatelier's principle is not applicable to common-ion effect.
(b) Ionic product of water increases with
increase of temperature because ionisation
of water is endothermic.
(c)
ka = c(1−α)10−5×cα
⇒ 10-5 = (1−α)10−5×α
⇒(1−α)α = 1
⇒α = 0.5
∴ Degree of dissociation(α) = 50%
(d) The Le Chatelier's principle is always applicable to common-ion effect.
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