Chemical Engineering MCQs

Page No. 180

In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is__________________?


aIndependent of the temperature

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bIncreased with the increase in pressure

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cDecreased with the increase in pressure

✓


dUnchanged by the pressure change

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The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?


aIncreases with pressure rise

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bDecreases with increasing pressure

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cBecomes zero at the critical point

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d Both B. & C.

✓


View Answer Both B. & C.

_____________ fuels require the maximum percentage of ‘excess air’ for complete combustion ?


aSolid

✓


b Liquid

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c Gaseous

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dNuclear

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View Answer Solid

Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?


a log (1/H+)

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b– log (1/H+)

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c1/log H+

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dNone of these

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View Answer log (1/H+)

Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?


aVapor to liquid

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bVapor to solid

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cSolid to liquid

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dOne allotropic form to another allotropic form

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Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?


a Are held together by stronger inter-molecular forces

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bMove faster

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c Have no definite shape

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dAre heavier

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If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?


aBe reduced to 1/4th

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bIncrease four times

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cIncrease two times

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d None of these

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View Answer Increase two times

Heat of reaction is not influenced by__________________?


aThe route/method through which final products are obtained

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bThe physical state (e.g., solid, liquid or gaseous) of reactants and products

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cWhether the reaction is carried out at constant temperature or constant pressure

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dNone of these

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A ‘limiting reactant’ is the one, which decides the ____________ in the chemical reaction?


aEquilibrium constant

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bConversion

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cRate constant

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d None of these

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View Answer Conversion

At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?


aecrease in mean free path

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b Increased collision rate among molecules

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cIncrease in molecular attraction

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dIncrease in average molecular speed

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