Chemical Engineering MCQs

Page No. 412

In the reaction, represented by Na2CO3 + HC1 → NaHO3 + NaCl, the equivalent weight of Na2CO3 is________________?


a53

✖


b5.3

✖


c106

✓


d10.6

✖


View Answer 106

Real gases approach ideal behaviour at___________________?


aHigh pressure & high temperature

✖


bLow pressure & high temperature

✓


cHigh pressure & low temperature

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dLow pressure & low temperature

✖



Cp – Cv for an ideal gas is equal to________________?


aR

✓


bR/2

✖


c2R

✖


d3R

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View Answer R

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?


a0.2

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b0.1

✖


c0.4

✖


d0.6

✓


View Answer 0.6

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = – 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about_____________________?


a0.19

✓


b0.19

✖


c0.40

✖


d0.67

✖


View Answer 0.19

At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?


aIncreases

✓


bDecreases

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cRemains unchanged

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dIncreases linearly

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View Answer Increases

For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the ____________ remains constant throughout the period of vaporisation ?


aDry bulb temperature

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bWet bulb temperature

✓


cHumidity

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dRelative saturation

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View Answer Wet bulb temperature

Kinematic viscosity of 1 m2 /second is equivalent to _____________ stokes?


a10

✖


b102

✖


c103

✖


d104

✓


View Answer 104

A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ?


a17

✓


b20

✖


c25

✖


d34

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View Answer 17

The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?


aLower than

✓


bHigher than

✖


cSame as

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dNot related to

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View Answer Lower than

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