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MCQs

Total Questions : 108 | Page 6 of 11 pages
Question 51. What is the factor that is responsible for salts like NaCl to dissolve in water easily?
  1.    Decrease in entropy
  2.    Increase in entropy
  3.    Increase in enthalpy
  4.    Decrease in enthalpy
 Discuss Question
Answer: Option B. -> Increase in entropy
Answer: (b).Increase in entropy
Question 52. If pH of solution of NaOH is 12.0 the pH of H₂SO₄ solution of same molarity will be?
  1.    2.0
  2.    12.0
  3.    1.7
  4.    10.0387
 Discuss Question
Answer: Option C. -> 1.7
Answer: (c).1.7
Question 53. Calculate the pH of a mixture of 0.10M acetic acid and 0.20M sodium acetate. The pKₐ of acetic acid is 4.76.
  1.    5.1
  2.    4.1
  3.    6.1
  4.    7.1
 Discuss Question
Answer: Option A. -> 5.1
Answer: (a).5.1
Question 54. Which can act as buffer?
  1.    NH₄Cl + HCl
  2.    CH₃COOH + H₂CO₃
  3.    40ml of 0.1M NaCN + 20ml of 0.1M HCN
  4.    NaCl + NaOH
 Discuss Question
Answer: Option C. -> 40ml of 0.1M NaCN + 20ml of 0.1M HCN
Answer: (c).40ml of 0.1M NaCN + 20ml of 0.1M HCN
Question 55. 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.
  1.    4.0
  2.    3.9
  3.    3.3
  4.    4.1
 Discuss Question
Answer: Option B. -> 3.9
Answer: (b).3.9
Question 56. Calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30.
  1.    3.2
  2.    3.3
  3.    3.4
  4.    3.5
 Discuss Question
Answer: Option D. -> 3.5
Answer: (d).3.5
Question 57. 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.
  1.    A and R are true, R is the correct explanation of A
  2.    A and R are true, R is not correct explanation of A
  3.    A is true but R is false
  4.    A is false but R is true
 Discuss Question
Answer: Option A. -> A and R are true, R is the correct explanation of A
Answer: (a).A and R are true, R is the correct explanation of A
Question 58. Which of the following mixture in aqueous solution of equimolar concentration acts as a buffer solution?
  1.    HNO₃ + NaOH
  2.    H₂SO₄ + KOH
  3.    NH₄OH(excess) + HCl
  4.    CH₃COOH + NaOH(excess)
 Discuss Question
Answer: Option C. -> NH₄OH(excess) + HCl
Answer: (c).NH₄OH(excess) + HCl
Question 59. 1M NaCl and 1M HCl are present in an aqueous solution. The solution is ____________
  1.    Not a buffer solution with pH < 7
  2.    Not a buffer solution with pH > 7
  3.    A buffer solution with pH < 7
  4.    A buffer solution with pH > 7
 Discuss Question
Answer: Option A. -> Not a buffer solution with pH < 7
Answer: (a).Not a buffer solution with pH < 7
Question 60. For an acid buffer solution the pH is 3. The pH can be increased by ____________
  1.    Increasing the concentration of salt
  2.    Increasing the concentration of acid
  3.    Decreasing the concentration of salt
  4.    Independent of concentration of acid & salt
 Discuss Question
Answer: Option A. -> Increasing the concentration of salt
Answer: (a).Increasing the concentration of salt

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