Free Solutions and Colloids MCQs with Answers
119 Solutions and Colloids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Solutions are described using molarity, molality, normality, mole fraction, percentage concentration and parts per million. Coverage also includes vapour-pressure lowering, boiling-point elevation, freezing-point depression and osmotic pressure, then distinguishes true solutions, colloids and suspensions by particle size, stability, light scattering and settling.
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Read the Solutions and Colloids notesFree MDCAT chapter notes with key terms119 questions Β· page 2 of 6
21. Ca(OH)2 is sparingly soluble having solubility constant value 6.5 x 10-6. What'll be its solubility:
- A. 2.75 x 10^-2
- B. 2.75 x 10^2
- C. 1.17 x 10^-2
- D. 3.63 x 10^3
Explanation: The solubility product constant (Ksp) expression for Ca(OH)2is: Ca(OH)2(s) β Ca2+(aq) + 2OH-(aq) The Ksp expression can be written as: Kspβ¦
Correct answer: 1.17 x 10^-2- A. MππΆπ3
- B. Aπ2(πΆπ3)3
- C. K2πΆπ3
- D. πππΆπ3
Explanation: The solubility of compounds in pure water depends upon their respective lattice energy.
Correct answer: K2πΆπ3- A. 0.1m
- B. 1.0m
- C. 10.0m
- D. Statement is wrong
Explanation: According to the formula for the elevation of boiling point βTb=kbΓm Where kb is the ebullioscopic constant and m is the molality of theβ¦
Correct answer: Statement is wrong- A. ππ(ππ»)2
- B. π»2πΆπ3
- C. Nπ»4πΆπ
- D. Nπ»4πH
Explanation: Strong bases are defined as the base which completely dissociates when dissolved in water and is a strong electrolyte.
Correct answer: ππ(ππ»)2- A. Molality
- B. Mole Fraction
- C. Molarity
- D. Both Molality and Molarity
Explanation: Molarity of a solution depends upon temperature because volume of a solution is temperature dependent.
Correct answer: Molarity- A. Ordinary filter paper
- B. Coarse filter paper
- C. Fine Filter paper
- D. Extremely fine filter paper
Explanation: Colloidal particles are small solid particles that are suspended in a fluid phase. Their size range is typically between 10nm.
Correct answer: Extremely fine filter paper- A. Saturated solution
- B. Super saturated solution
- C. Buffer solution
- D. Dilute solution
Explanation: A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.
Correct answer: Buffer solution- A. 6.50-7.00
- B. 7.20 - 7.25
- C. 7.50 - 7.55
- D. 7.35-7.40
Explanation: knowledge-based question Human blood acts as a buffer and it can maintain a pH between 7.3 and 7.4
Correct answer: 7.35-7.4029. Pure water is
- A. poor conductor
- B. very good conductor
- C. slight conductance
- D. neutral
Explanation: Pure water is a poor conductor of electricity. It has a low concentration of ions, primarily H+ and OHβ ions resulting from theβ¦
Correct answer: poor conductor- A. HOI < HOBr < HOCl
- B. HCl < HBr < HI
- C. HIO4 < HBrO4 < HClO4
- D. All of the above are correct order
Explanation: In HOX with increase in electronegativity acid strength increases. In H - X acid strength increases with decrease in bond energies.
Correct answer: All of the above are correct order- A. Glucose
- B. NaCl
- C. BaCl2
- D. Al2(SO4)3
Explanation: The lowest vapour pressure would be observed in the case Al2SO4)3as it gives maximum no.
Correct answer: Al2(SO4)3- A. 4 g/l
- B. 8 g/l
- C. 12 g/l
- D. 14 g/l
Explanation: Isotonic solutions are those solutions, which have the same osmotic pressure, this means that they have the same concentrations.
Correct answer: 12 g/l- A. the entropy of mixing is zero
- B. the free energy of mixing is zero
- C. the free energy as well as the entropy of mixing are each zero.
- D. the enthalpy of mixing is zero
Explanation: When A and b form an ideal solution, βHmax = 0.
Correct answer: the enthalpy of mixing is zero- A. Boiling points
- B. Vapour pressure at the same temperature
- C. Heat of vaporization
- D. Gaseous densities at the same temperature and pressure
Explanation: Gas density is defined as the mass of the gas occupying a certain volume at specified pressure and temperature.
Correct answer: Gaseous densities at the same temperature and pressure- A. Different boiling and different freezing points
- B. Same boiling and same freezing points
- C. Same freezing point but different boiling points
- D. Same boiling point but different freezing points
Explanation: The elevation in the boiling point and the depression in the freezing point are colligative properties and depend on the number of soluteβ¦
Correct answer: Same boiling and same freezing points- A. Lower
- B. Higher
- C. Same
- D. Can't be said
Explanation: In mixtures showing a positive deviation from Raoult's Law, the vapour pressure of the mixture is always higher than from an ideal mixture.
Correct answer: Lower- A. More than the vapour pressure of a solvent
- B. Less than the vapour pressure of solvent
- C. Equal to the vapour pressure of solvent
- D. None of these
Explanation: Addition of non-volatile solute always lowers the vapour pressure.
Correct answer: Less than the vapour pressure of solvent- A. Decimolar Al2(SO4)3
- B. Decimolar BaCl2
- C. Decimolar Na2SO4
- D. A solution obtained by mixing equal volumes and filtering
Explanation: Decimolar Al2(SO4)3 furnishes maximum number of ions.
Correct answer: Decimolar Al2(SO4)3- A. Berkeley and Hartley method
- B. Morse and Frazer method
- C. Pfeffer method
- D. None of the above
Explanation: It is more precise and takes minimum time.
Correct answer: Berkeley and Hartley method- A. Atmospheric pressure is low
- B. Temperature is low
- C. Atmospheric pressure is high
- D. None of the above
Explanation: The boiling occurs at lower temperature if atmospheric pressure is lower than 76 cm Hg.
Correct answer: Atmospheric pressure is low