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Equilibrium · Question 100

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

Correct relation between dissociation constants of a dibasic acid is

  1. Ka1 = Ka2
  2. Ka1 > Ka2
  3. Ka1 < Ka2
  4. Ka1 = 1 Ka2

Answer

(2) Ka1 > Ka2

Solution

A dibasic acid H2A ionises in two steps:

H2A H+ + HA-; Ka1

HA- H+ + A2-; Ka2

As per NCERT, the second proton is removed from a negatively charged ion HA-, which holds it more strongly (electrostatic attraction).

∴ The second ionisation is always weaker: Ka1 > Ka2

Answer: (2)

AIPMT 2001

Keep practising — Equilibrium

2

For any reversible reaction, if we increase concentration of the reactants, then effect on equilibrium constant

  1. depends on amount of concentration
  2. unchanged
  3. decrease
  4. increase
AIPMT 2000
3

Conjugate acid of NH2- is

  1. NH4OH
  2. NH4+
  3. NH2-
  4. NH3
AIPMT 2000
4

Which statement is wrong about pH and H+?

  1. pH of neutral water is not zero.
  2. Adding 1 N solution of CH3COOH and 1 N solution of NaOH, pH will be seven.
  3. [H+] of dilute and hot H2SO4 is more than concentrated and cold H2SO4
  4. Mixing solution of CH3COOH and HCl. pH will be less than 7.
AIPMT 2000
5

Equilibrium constant Kp for following reaction MgCO3(s) MgO(s) + CO2(g)

  1. Kp = PCO2
  2. Kp = PCO2 PCO2 PMgOPMgCO3
  3. Kp = PCO2 + PMgOPMgCO3
  4. Kp = PMgCO3PCO2 + PMgO
AIPMT 2000

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