Buffering against pH changes in Biological Systems MCQ

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• Buffer capacity is maximum when __________
  ক

  One mole of NH4Cl is added to two moles of NH4OH

  খ

  One mole of NH4Cl is added to one moles of NH4OH

  গ

  One mole of NH4Cl is added to one mole of NaOH

  ঘ

  One mole of NaCl is added to one mole of NaOH
• The buffer capacity is equal to __________
  ক

  Δn / ΔpH

  খ

  pH / Δn

  গ

  ± 1pKa

  ঘ

  ± 2pKa
• For an acid buffer solution the pH is 3. The pH can be increased by ____________
  ক

  Increasing the concentration of salt

  খ

  Increasing the concentration of acid

  গ

  Decreasing the concentration of salt

  ঘ

  Independent of concentration of acid & salt
• 1M NaCl and 1M HCl are present in an aqueous solution. The solution is ____________
  ক

  Not a buffer solution with pH < 7

  খ

  Not a buffer solution with pH > 7

  গ

  A buffer solution with pH < 7

  ঘ

  A buffer solution with pH > 7
• Assertion A: pH of a buffer solution solution does not change on dilution. Reason R: On dilution the ration of concentration of salt and acid (or base) remains unchanged.
  ক

  A and R are true, R is the correct explanation of A

  খ

  A and R are true, R is not correct explanation of A

  গ

  A is true but R is false

  ঘ

  A is false but R is true
• Calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30.
  ক

  3.2

  খ

  3.3

  গ

  3.4

  ঘ

  3.5
• Calculate the pKa of lactic acid, given that when the concentration of lactic acid is 0.010M and the concentration of lactate is 0.087M, the pH is 4.80.
  ক

  4.0

  খ

  3.9

  গ

  3.3

  ঘ

  4.1
• Calculate the pH of a mixture of 0.10M acetic acid and 0.20M sodium acetate. The pKa of acetic acid is 4.76.
  ক

  5.1

  খ

  4.1

  গ

  6.1

  ঘ

  7.1
• Which can act as buffer?
  ক

  NH4 Cl + HCl

  খ

  CH3 COOH + H2 CO3

  গ

  40ml of 0.1M NaCN + 20ml of 0.1M HCN

  ঘ

  NaCl + NaOH