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Equilibrium · Question 34

NEET 2016 (Phase 1)MCQMedium📈 Topic in 38% papers+4−1
1

MY and NY3, two nearly insoluble salts, have the same Ksp values of 6.2 10-13 at room temperature. Which statement would be true in regard to MY and NY3?

  1. The salts MY and NY3 are more soluble in 0.5 M KY than in pure water.
  2. The addition of the salt of KY to solution of MY and NY3 will have no effect on their solubilities.
  3. The molar solubilities of MY and NY3 in water are identical.
  4. The molar solubility of MY in water is less than that of NY3.

Answer

(4) The molar solubility of MY in water is less than that of NY3.

Solution

For MY M+ + Y-: Ksp = s2

⇒ sMY = 6.2 10-13 7.9 10-7 mol L-1

For NY3 N3+ + 3Y-: Ksp = s(3s)3 = 27s4

⇒ sNY3 = ( 6.2 10-1327 )1/4 3.9 10-4 mol L-1

∴ Molar solubility of MY < that of NY3.

∵ KY supplies the common ion Y- ⇒ solubility of both salts decreases, so (1) and (2) are wrong.

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Equilibrium

2

The percentage of pyridine (C5H5N) that forms pyridinium ion (C5H5N+H) in a 0.10 M aqueous pyridine solution (Kb for C5H5N = 1.7 10-9) is

  1. 0.0060%
  2. 0.013%
  3. 0.77%
  4. 1.6%
NEET 2016 (Phase 2)
3

The solubility of AgCl(s) with solubility product 1.6 10-10 in 0.1 M NaCl solution would be

  1. 1.25 10-5 M
  2. 1.6 10-9 M
  3. 1.6 10-11 M
  4. zero
NEET 2016 (Phase 2)
4

Which of the following fluoro-compounds is most likely to behave as a Lewis base ?

  1. BF3
  2. PF3
  3. CF4
  4. SiF4
NEET 2016 (Phase 2)
5

If the equilibrium constant for N2(g) + O2(g) 2NO(g) is K, the equilibrium constant for 12 N2(g) + 12 O2(g) NO(g) will be

  1. 12K
  2. K
  3. K2
  4. K1/2
AIPMT 2015
6

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

  1. 2.0
  2. 7.0
  3. 1.04
  4. 12.65
AIPMT 2015
7

Which one of the following pairs of solution is not an acidic buffer ?

  1. CH3COOH and CH3COONa
  2. H2CO3 and Na2CO3
  3. H3PO4 and Na3PO4
  4. HClO4 and NaClO4
AIPMT 2015
8

The Ksp of Ag2CrO4, AgCl, AgBr and AgI are respectively, 1.1 10-12, 1.8 10-10, 5.0 10-13, 8.3 10-17. Which one of the following salts will precipitate last if AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na2CrO4?

  1. AgBr
  2. Ag2CrO4
  3. AgI
  4. AgCl
AIPMT 2015 (Cancelled)
9

If the value of equilibrium constant for a particular reaction is 1.6 1012, then at equilibrium the system will contain

  1. mostly products
  2. similar amounts of reactants and products
  3. all reactants
  4. mostly reactants.
AIPMT 2015 (Cancelled)
10

Which of the following salts will give highest pH in water?

  1. KCl
  2. NaCl
  3. Na2CO3
  4. CuSO4
AIPMT 2014
11

Using the Gibbs energy change, G = +63.3 kJ, for the following reaction, Ag2CO3(s) 2Ag+(aq) + CO32-(aq) the Ksp of Ag2CO3(s) in water at 25 C is ( R = 8.314 J K-1 mol-1)

  1. 3.2 10-26
  2. 8.0 10-12
  3. 2.9 10-3
  4. 7.9 10-2
AIPMT 2014

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