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Equilibrium · Question 26

NEET (UG) 2019MCQMedium📈 Topic in 25% papers+4−1
1

Which will make basic buffer?

  1. 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH
  2. 100 mL of 0.1 M HCl + 100 mL of 0.1 M NH4OH
  3. 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH
  4. 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH

Answer

(1) 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH

Solution

A basic buffer contains a weak base and its salt with a strong acid (e.g. NH4OH + NH4Cl).

(1) HCl = 100 × 0.1 = 10 mmol; NH4OH = 200 × 0.1 = 20 mmol

HCl + NH4OH NH4Cl + H2O ⇒ 10 mmol NH4Cl + 10 mmol NH4OH left ⇒ basic buffer

(2) 10 mmol each ⇒ only NH4Cl (salt) ⇒ not a buffer

(3) NaOH = 5 mmol, CH3COOH = 2.5 mmol ⇒ excess strong base NaOH + CH3COONa ⇒ not a buffer

(4) 10 mmol each ⇒ only CH3COONa ⇒ not a buffer

Answer: (1)

NEET (UG) 2019

Keep practising — Equilibrium

2

Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : pH of which one of them will be equal to 1?

  1. B
  2. A
  3. D
  4. C
NEET 2018
3

The solubility of BaSO4 in water is 2.42 10-3 g L-1 at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4 = 233 g mol-1)

  1. 1.08 10-10 mol2 L-2
  2. 1.08 10-12 mol2 L-2
  3. 1.08 10-14 mol2 L-2
  4. 1.08 10-8 mol2 L-2
NEET 2018
4

Which one of the following conditions will favour maximum formation of the product in the reaction A2(g) + B2(g) X2(g), rH = -X kJ ?

  1. Low temperature and high pressure
  2. Low temperature and low pressure
  3. High temperature and high pressure
  4. High temperature and low pressure
NEET 2018
5

The equilibrium constants of the following are N2 + 3H2 2NH3; K1 N2 + O2 2NO; K2 H2 + 12O2 H2O; K3 The equilibrium constant (K) of the reaction : 2NH3 + 52O2 2NO + 3H2O will be

  1. K2K33/K1
  2. K2K3/K1
  3. K23K3/K1
  4. K1K33/K2
NEET 2017
6

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.2 10-4 mol L-1. Solubility product of Ag2C2O4 is

  1. 2.66 10-12
  2. 4.5 10-11
  3. 5.3 10-12
  4. 2.42 10-8
NEET 2017
7

A 20 litre container at 400 K contains CO2(g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value, will be (Given that : SrCO3(s) SrO(s) + CO2(g), Kp = 1.6 atm)

  1. 10 litre
  2. 4 litre
  3. 2 litre
  4. 5 litre
NEET 2017
8

Consider the following liquid-vapour equilibrium. Liquid Vapour Which of the following relations is correct ?

  1. d PdT2 = - HvT2
  2. d PdT = HvRT2
  3. d GdT2 = HvRT2
  4. d PdT = - HvRT
NEET 2016 (Phase 1)
9

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.
NEET 2016 (Phase 1)
10

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)
11

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)

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