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


bIncreased with the increase in pressure


cDecreased with the increase in pressure


dUnchanged by the pressure change



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


bDecreases with increasing pressure


cBecomes zero at the critical point


d Both B. & C.


View Answer Both B. & C.

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


aSolid


b Liquid


c Gaseous


dNuclear


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+)


b– log (1/H+)


c1/log H+


dNone of these


View Answer log (1/H+)

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


aVapor to liquid


bVapor to solid


cSolid to liquid


dOne allotropic form to another allotropic form



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


a Are held together by stronger inter-molecular forces


bMove faster


c Have no definite shape


dAre heavier



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


bIncrease four times


cIncrease two times


d None of these


View Answer Increase two times

Heat of reaction is not influenced by__________________?


aThe route/method through which final products are obtained


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


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


dNone of these



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


aEquilibrium constant


bConversion


cRate constant


d None of these


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


b Increased collision rate among molecules


cIncrease in molecular attraction


dIncrease in average molecular speed



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