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Equilibrium · Question 97

AIPMT 2001MCQMedium📈 Topic in 12% papers+4−1
1

In HS-, I-, R-NH2, NH3 order of proton accepting tendency will be

  1. I- > NH3 > R-NH2 > HS-
  2. NH3 > R-NH2 > HS- > I-
  3. R-NH2 > NH3 > HS- > I-
  4. HS- > R-NH2 > NH3 > I-

Answer

(3) R-NH2 > NH3 > HS- > I-

Solution

Proton accepting tendency = Brønsted basic strength; a stronger base has a weaker conjugate acid.

R-NH2 vs NH3: the +I effect of the alkyl group increases electron density on N ⇒ R-NH2 > NH3.

NH3 vs HS-: conjugate acid NH4+ (pKa 9.3) is weaker than H2S (pKa 7) ⇒ NH3 > HS-.

I- is the conjugate base of the very strong acid HI ⇒ weakest base.

∴ R-NH2 > NH3 > HS- > I-

Answer: (3)

AIPMT 2001

Keep practising — Equilibrium

2

Ionisation constant of CH3COOH is 1.7 10-5 and concentration of H+ ions is 3.4 10-4. Then find out initial concentration of CH3COOH molecules.

  1. 3.4 10-4
  2. 3.4 10-3
  3. 6.8 10-4
  4. 6.8 10-3
AIPMT 2001
3

Solubility of M2S salt is 3.5 10-6 then find out solubility product.

  1. 1.7 10-6
  2. 1.7 10-16
  3. 1.7 10-18
  4. 1.7 10-12
AIPMT 2001
4

Correct relation between dissociation constants of a dibasic acid is

  1. Ka1 = Ka2
  2. Ka1 > Ka2
  3. Ka1 < Ka2
  4. Ka1 = 1 Ka2
AIPMT 2001
5

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
6

Conjugate acid of NH2- is

  1. NH4OH
  2. NH4+
  3. NH2-
  4. NH3
AIPMT 2000
7

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
8

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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