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Equilibrium

AIPMT 2002MCQEasyNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2002

Which has highest pH?

  1. CH3COOK
  2. Na2CO3
  3. NH4Cl
  4. NaNO3

Answer

(2) Na2CO3

Solution

NH4Cl, a salt of weak base and strong acid, gives an acidic solution (pH < 7), while NaNO3, a salt of strong acid and strong base, is neutral (pH = 7).

CH3COOK and Na2CO3 are salts of weak acids and strong bases, so both are basic (pH > 7).

∵ H2CO3 (via HCO3-) is a much weaker acid than CH3COOH, CO32- is a much stronger base than CH3COO- and hydrolyses to a greater extent:

CO32- + H2O HCO3- + OH-

∴ Na2CO3 solution has the highest pH.

Answer: (2)

Keep practising — Equilibrium

Ques. 2AIPMT 2002

Solution of 0.1 N NH4OH and 0.1 N NH4Cl has pH 9.25. Then find out pKb of NH4OH

  1. 9.25
  2. 4.75
  3. 3.75
  4. 8.25
Ques. 3AIPMT 2001

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-
Ques. 4AIPMT 2001

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
Ques. 5AIPMT 2001

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
Ques. 6AIPMT 2001

Correct relation between dissociation constants of a dibasic acid is

  1. Ka1 = Ka2
  2. Ka1 > Ka2
  3. Ka1 < Ka2
  4. Ka1 = 1 Ka2
Ques. 7AIPMT 2000

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
Ques. 8AIPMT 2000

Conjugate acid of NH2- is

  1. NH4OH
  2. NH4+
  3. NH2-
  4. NH3
Ques. 9AIPMT 2000

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.
Ques. 10AIPMT 2000

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

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