Question 71 : Which of the following gravity scales is used exclusively for liquids heavier than water ?
1. none of these
2. Baumme scale
3. Twaddel scale
4. API scale
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Question 72 : Heat of transition is the heat evolved or absorbed, when a substance is converted from
1. solid to liquid.
2. vapor to solid.
3. one allotropic form to another allotropic form.
4. vapor to liquid.
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Question 73 : Pick out the wrong statement.
1. 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.
2. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist.
3. Generally, the heat capacities of compounds are lower in the liquid than in the solid state.
4. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperat
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Question 74 : Recycling in a chemical process facilitates
1. enrichment of product
2. increased yield
3. all of three
4. heat conservation
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Question 75 : Measurement of the amount of dry gas collected over water from volume of moist gas is based on the
1. Charle's law.
2. Dalton's law of partial pressures.
3. Boyle's law.
4. Avogadro's hypothesis.
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Question 76 : Weight of 56 litres of ammonia at N.T.P. is __________ gm.
1. 45
2. 5
3. 8600
4. 56
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Question 77 : Dissolving a solute in a solvent does not change its
1. vapour pressure
2. viscosity
3. specific heat
4. none of these
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Question 78 : For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).
1. inversely
2. exponentially
3. negligibly
4. linearly
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Question 79 : In physical adsorption, as compared to chemisorption, the
1. rate of adsorption is controlled by the resistance to surface reaction.
2. heat of adsorption is very large.
3. activation energy is very high.
4. quantity adsorbed per unit mass is higher.
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Question 80 : Colligative properties of a dilute solution are those which depend entirely upon the
1. number of solute molecules contained in a given volume of the solvent.
2. none of these.
3. chemical composition of the solute.
4. constitution of the solute.
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