Chemical Engineering - Stoichiometry

1. 

Colligative properties of a dilute solution are those which depend entirely upon the

A. constitution of the solute.
B. chemical composition of the solute.
C. number of solute molecules contained in a given volume of the solvent.
D. none of these.

Answer: Option A

Explanation:

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2. 

For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).

A. inversely
B. exponentially
C. linearly
D. negligibly

Answer: Option C

Explanation:

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3. 

Pick out the wrong statement.

A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong.
B. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state.
C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
D. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist.

Answer: Option C

Explanation:

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4. 

Measurement of the amount of dry gas collected over water from volume of moist gas is based on the

A. Charle's law.
B. Dalton's law of partial pressures.
C. Avogadro's hypothesis.
D. Boyle's law.

Answer: Option B

Explanation:

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5. 

In physical adsorption, as compared to chemisorption, the

A. quantity adsorbed per unit mass is higher.
B. rate of adsorption is controlled by the resistance to surface reaction.
C. activation energy is very high.
D. heat of adsorption is very large.

Answer: Option A

Explanation:

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