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Quiz 190
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3781. Which of the following is not a use of buffer solution?
Calibration of pH meter
Preserving biological specimen
Maintaining pH of blood
Predicting substrate concentration
3782. The pH range of human blood is:
7.35 to 7.45
8.35 to 8.45
6.35 to 7.45
5.57 to 6.57
3783. Buffer capacity is maximum when both components have:
High concentration
Equal concentration
Low concentration
Different concentration
3784. Which of the following is a strong electrolyte in solution?
Acetic acid
Carbonic acid
Ammonium hydroxide
Potassium iodide
3785. Purification of NaCl by passing HCl gas into its saturated solution demonstrates:
Law of Mass Action
Hess's Law
Common Ion Effect
Henry's Law
3786. A buffer solution is not formed by:
NH₄OH + NH₄Cl
CH₃COOH + CH₃COONa
C₆H₅COOH + C₆H₅COONa
HCl + NaCl
3787. An acidic buffer consists of:
Strong acid + salt with weak base
Weak acid and its salt with strong base
Strong acid + salt with strong base
Weak acid + salt with weak base
3788. The pH of human blood is:
7.35 to 7.45
8.35 to 8.45
6.35 to 7.45
5.57 to 6.57
3789. Which one of the following is the correct presentation for Ksp? AgCl ⇌ Ag⁺ + Cl⁻
Ksp = [AgCl] / [Ag⁺][Cl⁻]
Ksp = [Ag⁺][Cl⁻]
Ksp = [Ag⁺][Cl⁻] / [AgCl]
Ksp = [AgCl]
3790. The value of Ksp for PbSO₄ at 25°C is:
1.6 × 10⁻⁸ mol² dm⁻⁶
1.6 × 10⁻⁵ mol² dm⁻⁶
1.6 × 10⁻⁷ mol² dm⁻⁶
1.6 × 10⁻⁶ mol² dm⁻⁶
3791. The product of ion concentrations of a sparingly soluble salt, each raised to its power at 298K is:
Ksp
Ka
Kw
Kb
3792. Precipitation occurs if the ionic concentration is:
Less than Ksp
More than Ksp
Equal to Ksp
Present in any amount
3793. The solubility product (Ksp) predicts whether:
Diffusion occurs
Solubility occurs
Precipitation occurs or not
Boiling point increases
3794. If the value of Ksp is large, the salt is:
More soluble
Less soluble
Moderately soluble
Not concentrated
3795. The value of solubility product (Ksp) depends only on:
Temperature
Solvent
Pressure
Catalyst
3796. If solubility of PbS at 25°C is 4.0 × 10⁻²⁸, then ionic concentration is:
4 × 10⁻¹⁴
2 × 10⁻¹⁴
1 × 10⁻¹⁴
3.0 × 10⁻¹⁰
3797. In an oxidation reaction, atoms of an element lose electrons and increase in:
Oxidation state
Reduction
Electrode
Negative charge
3798. In MgCl₂, the oxidation state of Cl is:
0
2
-2
-1
3799. Which one of the following is a redox reaction?
NaCl + AgNO₃ → NaNO₃ + AgCl₂
2Cl⁻ → Cl₂ + 2e⁻
2Na + Cl₂ → 2NaCl
Na⁺ + 1e⁻ → Na
3800. In SO₃²⁻, the oxidation number of sulphur is:
-8
2
-6
6
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