CHEMICAL AND IONIC EQUILIBRIA MCQs

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

CHEMICAL AND IONIC EQUILIBRIA

Which statement is not true regarding Lewis acids and bases?

  1. Lewis base must contain an atom having less than an octet of electron
  2. Substances which donate a pair of electrons are called Lewis bases
  3. All Lewis bases are also Bronsted bases
  4. NH3 and H2O both behaves as Lewis bases

Lewis base must contain an atom having less than an octet of electron

At equilibrium the free energy change (ΔF) for a reaction is

  1. Zero
  2. Minimum
  3. Maximum
  4. Infinite

Zero

Which properties of a system does not change in a state of equilibrium?

  1. Concentration
  2. Density
  3. Pressure
  4. All of A, B, and C

All of A, B, and C

In the equilibrium reaction N2 + 3H2 ⇄ 2NH3 + 22.9kcal, the equilibrium shifts to the forward direction when ________ .

  1. Increasing the P as well as T
  2. Decreasing the P as well as T
  3. Increasing the P and decreasing the T
  4. Decreasing the P and increasing the T

Increasing the P as well as T

According to Le-Chatlier’s principle, the formation of NO2 at equilibrium in the reaction should be helped by 2NO + O2 ⇄ 2NO₂+ heat

  1. Low T, high P
  2. Low T and low P
  3. High T and high P
  4. High temperature

Low T, high P

Formation of SO3 takes place according to the following reaction 2SO2 + O2 ⇄ 2SO3 ΔH = -45.2 kcal. Which factors will help the formation of SO3?

  1. Increase of T
  2. Removal of O2
  3. Increase of P
  4. Increase of volume

Increase of P

For Which equilibrium does decrease in pressure not help the forward reaction?

  1. CaCO3 ⇄ CaO + CO2
  2. 2NH3 ⇄ N2 + 3H2
  3. NH4Cl ⇄ NH3 + HCl
  4. CO + 2H2 ⇄ CH3OH

CO + 2H2 ⇄ CH3OH

Four moles of A are mixed with four moles of B when 2 moles of Care formed at equilibrium, according to the reaction A+B ⇄ C + D. What is the value of the equilibrium constant?

A 2/2

  1. 8
  2. 1
  3. 1/4

1/4

When 3 moles of ethyl alcohol are mixed with 3 mole of acetic acid. 2 moles of ester are formed at equilibrium according to the equation CH3COOH + C2H5H ⇄ CH3COOC2H5 + H₂O. What is the value of the equilibrium constant for the reaction?

  1. 4
  2. 4/9
  3. 2
  4. 3/9

4/9

In the reaction HCN + H2O ⇄ H3O + CN. The conjugate acid-base pair is

  1. HCN, H3O+
  2. – HCN, CN
  3. CN-, H3O+
  4. – H2O, CN

HCN, CN

According to Arrhenius theory, an acid is defined as substance which

  1. Furnishes H2O+ ion in water
  2. Donates H+ ion in ammonia
  3. Contains CI– ions
  4. Accepts an electron pair

Furnishes H2O+ ion in water

Which can act both as a Bronsted acid and a Bronsted base?

  1. Na2CO3
  2. HCO3
  3. OH
  4. NH3

HCO3

Which is not a Lewis base?

  1. CN
  2. NH3
  3. ROH

D AICI3

AICI3

Which statement is not  related with chemical equilibrium?

  1. The chemical equilibrium is static in nature
  2. The equilibrium can be approached from either direction
  3. The chemical equilibrium is dynamic in nature
  4. The properties of the system become constant

The chemical equilibrium is static in nature

HS is a conjugate base of

  1. S2
  2. H₂SO4
  3. H₂SO3
  4. H2S

H2S

Which acid-base reaction is according to Lewis classification?

  1. H+ + OH ⇄ H2O
  2. HCN H2O ⇄ H3O + CN
  3. H₂O + H2O ⇄ H3O+ OH
  4. (CH3)3N+BF3 ⇄ (CH3) 3N: BF3

(CH3)3N+BF3 ⇄ (CH3) 3N: BF3

The sum of pH and pOH in aqueous solution is equal to the

  1. 14
  2. 7
  3. pKw
  4. Zero

14

The value of Kw at 25°C

  1. 14
  2. 1.4
  3. 0.14
  4. 1× 10-14

1× 10-14

Which solution has pH = 11?

  1. 1x 10-3 M NaOH
  2. 1 x 10-11 M HCI
  3. 1x 10-11 M NaOH
  4. 1x 103 M NaOH

1x 10-3 M NaOH

What is the pKa of an acid having ionization constant 1 x 10-5?

  1. -3
  2. -9
  3. 9
  4. 5

5

Which will have the higher pH?

  1. 0.1 N NaOH
  2. 0.1 N CH3COOH
  3. 0.1 N HCI
  4. 0.01 N HCI

0.1 N NaOH

The pink colour of phenolphthalein in basic medium is due to the

  1. Cationic form
  2. OH ions of the base
  3. Neutral form
  4. anionic form

anionic form

A buffer solution can be prepared from a

  1. CH3COOH and CH3COONa
  2. CH3COOH and HCI
  3. CH3COOH and NaOH
  4. CH3COONa and HCI

CH3COOH and CH3COONa

The true order of increasing acid strength is

  1. HNO4 < H₂N₂O₂ < HNO₂
  2. H₂N₂O₂ < HNO3 < HNO₂
  3. HNO₂ < HNO3 < H₂N₂O₂
  4. H₂N₂O₂ < HNO₂ < HNO3

H₂N₂O₂ < HNO₂ < HNO3

The true order of acidic strength is

  1. HF < HCI < HBr < HI
  2. HI < HBr < HCI < HF
  3. HI < HBr < HF < HCl
  4. HF < HCI < HI < HBr

HF < HCI < HBr < HI

What is the true order of acid strength?

  1. HIO1 > HBrO1 > HCIO1
  2. HBrO1 > HCIO1 > HIO1
  3. HBro1 > HIO1 > HCIO1
  4. HCIO1 > HBrO1 > HIO1

HCIO1 > HBrO1 > HIO1

Which specie is a stronger acid than formic acid, HCOOH in aqueous solution?

  1. H2SO4
  2. NH4
  3. CH3COOH
  4. H4P2O7

H2SO4

The degree of dissociation of weak acid increases with

  1. Decreasing concentration
  2. Increasing pressure
  3. Increasing concentration
  4. Decreasing pressure

Decreasing concentration

A 2M solution of H2SO4 would have how many moles of H ion in one liter?

  1. 1.0
  2. 4.0
  3. 7.0
  4. 2.0

4.0

Which hypothetical reaction is helped by increase of temperature and pressure?

  1. 2A + B ⇄ C + D ΔH = +ve
  2. A + 2B ⇄ 2C+D ΔH = +ve
  3. A + B ⇄ C+D ΔH = -ve
  4. 2A+2B ⇄ 2C + 2D ΔH = -ve

2A + B ⇄ C + D ΔH = +ve

What is the  pH of a neutral solution at 100°C when Kw = 1.0 x 10-12?

  1. 6
  2. 4
  3. 0
  4. 2

6

The pKa of acetic acid is 4.74, which implies that _____ .

  1. pH of 1N solution is 4.74
  2. At pH 4.74, the dissociation of acetic acid is minimum
  3. At pH 4.74, the dissociation of acetic acid is maximum
  4. At pH 4.74, half of the acetic acid molecules are dissociated in the solution

At pH 4.74, half of the acetic acid molecules are dissociated in the solution

Which is a buffer solution?

  1. CH3COOH + CH3COONa
  2. CH3COOH + HCI
  3. CH3COOH + NaOH
  4. CH3COOH + NH4OH

CH3COOH + CH3COONa

Which is not a buffer?

  1. H₂CO/HCO3
  2. NH4OH/CH3COOH
  3. CH3COOH/CH3COONa
  4. NH4CH/NH4CH

NH4OH/CH3COOH

Which parameter of a chemical reaction will change with the use of a catalyst?

  1. K, the rate constant
  2. ΔS, change in entropy
  3. ΔE, change in internal energy
  4. ΔP, change in free energy

K, the rate constant

What is the approximate pH of human blood?

  1. 7.5
  2. 6.2
  3. 7.8
  4. 7.2

7.2

Azeotropic mixture can be separated by which of the following?

  1. Vacuum distillation
  2. Fractional distillation
  3. Simple distillation
  4. Destructive distillation

Vacuum distillation

Which has highest pH?

  1. 0.1 M HCI
  2. 0.2 M HCI
  3. 0.1 M HNO3
  4. 0.1 M NaOH

0.1 M NaOH

If 20 ml of 0.5 N salt solution is diluted to one litre, what is the new concentration?

  1. 1N
  2. 0.00 1N
  3. 0.01 N
  4. 10 N

0.01 N

The pH of milk is

  1. 5.5
  2. 8.5
  3. 7.5
  4. 6.5

6.5

What is the pH of soft drink?

  1. 2
  2. 6
  3. 5
  4. 3

3

What is the sum of [H+] and [OH–] in pure water?

  1. 7
  2. 14
  3. 20
  4. 12

14

Which affect the Kc value?

  1. Catalyst
  2. Pressure
  3. Temperature
  4. All of A, B, and C

Temperature

What is the pH of 0.001 M HCl in water?

  1. 5
  2. 3
  3. 2
  4. 4

3

What is the pH of 0.001 M NaOH?

  1. 14.
  2. 11
  3. 13
  4. 12

11

What is the molarity of pure water?

  1. 7 M
  2. 18 M
  3. 55.5 M
  4. 14 M

55.5 M

The precipitation occurs if the ionic concentration is:

  1. More than Ksp
  2. Less than Ksp
  3. Equal to ksp
  4. None of A, B, and C

More than Ksp

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