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Equilibrium · Question 95

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

Which has highest pH?

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

Answer

(2) Na2CO3

Solution

⇒ NH4Cl (salt of weak base and strong acid) gives an acidic solution, pH < 7.

⇒ NaNO3 (salt of strong acid and strong base) is neutral, pH = 7.

⇒ CH3COOK and Na2CO3 (salts of weak acids and strong bases) 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)

AIPMT 2002

Keep practising — Equilibrium

2

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
AIPMT 2002
3

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-
AIPMT 2001
4

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
5

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
6

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
7

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
8

Conjugate acid of NH2- is

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

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
10

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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