Practice Pakistan's most useful MCQs for competitive exams

“The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

• (A)  Raoult’s
• (B)  Henry’s
• (C)  Amagat’s
• (D)  None of these

Answer

Submitted By :Ali Uppal

______________ equation gives the effect of temperature on heat of reaction ?

• (A)  Kirchoff’s
• (B)  Maxwell’s
• (C)  Antoine
• (D)  Kistyakowsky

Answer

Submitted By :Ali Uppal

Addition of a non-volatile solute to a pure solvent ____________________?

• (A)  Increases its freezing point
• (B)  Increases its boiling point
• (C)  Decreases its freezing point
• (D)  Both

Answer

Submitted By :Ali Uppal

If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its___________________?

• (A)  Bubble point
• (B)  Saturation temperature
• (C)  Dew point
• (D)  Both

Answer

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1 torr is equal to ______________ mm Hg column?

• (A)  1
• (B)  0.1
• (C)  10
• (D)  1000

Answer

Submitted By :Ali Uppal

The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________?

• (A)  Specific heat
• (B)  1 Kcal
• (C)  Sensible heat
• (D)  Latent heat

Answer

Submitted By :Ali Uppal

Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?

• (A)  Do not lose energy on collision
• (B)  Are above the inversion temperature
• (C)  Do not exert attractive force on each other
• (D)  Do work equal to loss in kinetic energy

Answer

Submitted By :Ali Uppal

Which of the following is not a colligative property ?

• (A)  Osmotic pressure
• (B)  Depression of freezing point
• (C)  Lowering of vapor pressure
• (D)  None of these

Answer

Submitted By :Ali Uppal

Total energy at a point comprises of _____________ energy?

• (A)  Potential & kinetic
• (B)  Pressure
• (C)  Internal
• (D)  All

Answer

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Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

• (A)  Mixing
• (B)  Adsorption
• (C)  Wetting
• (D)  Complete wetting

Answer

Submitted By :Ali Uppal