Sodium benzoate and benzoic acid are mixed in equimolar ration to form buffer if pKa is 2 what will be the pH ?

Related Mcqs:

1. Which compound form benzoic acid on oxidation with acidified KMnO4 or K2Cr2O7 ?

   A. Toluene
   B. Ethyl benzene
   C. n-propyl benzene
   D. All

2. 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

3. If a buffer solution of higher pH than seven is to be made we use___________________?

   A. Strong acid and strong base
   B. Weak acid and strong base
   C. Weak acid and strong base
   D. Weak acid and its salt with strong base

4. Which one of the following is a buffer solution ?

   A. brine
   B. blood
   C. glue
   D. solution of CuSO4

5. When 0.01 moles of NaOH are added to a buffer solution, its PH changes from 4.745 to 4.832. What is its?

   A. 0.115
   B. 0.900
   C. 0.015
   D. 0.215

   Submitted by: Muhammad Ali Kunbhar

6. The main buffer system of the human blood is____________?

   A. H₂CO₃ – HCO₃
   B. H₂CO₃ – CO₃^2-
   C. CH₃COOH – CH₃COO^–
   D. NH₂CONH₂ – NH₂CONH⁺

   Submitted by: Muhammad Ali Kunbhar

7. Acid present in acid rain may be__________________?

   A. H2SO4
   B. HNO3
   C. both A and B
   D. none

8. The common thing in phthalic acid and oxalic acid is that both are_________________?

   A. Aromatic
   B. Dicarboxylic
   C. Hydrocarbons
   D. Strong acids

9. Phosphoric acid is a weak acid and its basicity is____________________?

   A. 1
   B. 3
   C. zero
   D. 2

10. When sulphuric acid is treated with ethanol sulphuric acid behaves like________________?

    A. an acid
    B. a dehydrating agent
    C. an oxidizing agent
    D. as sulphonating agent