Practice Pakistan's most useful MCQs for competitive exams

Addition of CH3COOH and CH3COONa gives in water_______________?

• (A)  Standard solution
• (B)  buffer solution
• (C)  acidic buffer solution
• (D)  both B & C

Answer

Submitted By :Ali Uppal

When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called_________________?

• (A)  common ion effect
• (B)  solubility product
• (C)  dissociation constant
• (D)  dissociation constant for an acid

Answer

Submitted By :Ali Uppal

Any substance which accepts H+ is base favours the concept___________________?

• (A)  Lowrys
• (B)  Lewis
• (C)  Arrhenius
• (D)  None of these

Answer

Submitted By :Ali Uppal

Ka<10-3 means______________?

• (A)  Very strong base
• (B)  Very weak acid
• (C)  Very strong acid
• (D)  Very strong salt

Answer

Submitted By :Ali Uppal

Idea of pH and pOH was put forward by________________?

• (A)  Gibbs
• (B)  Einstein
• (C)  Sorenson
• (D)  Chadwick

Answer

Submitted By :Ali Uppal

In case of gases Kc is replaced by_______________?

• (A)  Ka
• (B)  Kb
• (C)  Kp
• (D)  K

Answer

Submitted By :Ali Uppal

At start of reaction the concentration of reactants is_______________?

• (A)  high
• (B)  low
• (C)  according to Kc
• (D)  constant

Answer

Submitted By :Ali Uppal

Chemical equilibrium state is_______________?

• (A)  dynamic state
• (B)  static state
• (C)  free state
• (D)  unidirectional state

Answer

Submitted By :Ali Uppal

Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?

• (A)  0.0002M HCI
• (B)  0.2 mole of NaCI with 0.2 mole of HNO3
• (C)  0.4 mole of CH3COOH with 0.4 mole of NaOH
• (D)  0.4 mole of NH3 with 0.2 mole of HCI

Answer

Submitted By :Ali Uppal

Which of following is not a base______________?

• (A)  KOH
• (B)  NH3
• (C)  PH3
• (D)  BF3

Answer

Submitted By :Ali Uppal