The atomic weight of elements are usually fractional because
A.these are mixtures of allotropes
B.these are mixtures of isotopes
C.these are mixtures of isobars
D.element always contains some impurities
Category: Chemical Engineering Mcqs
Flash points above 50?C are determined by
A.Abel apparatus
B.Saybolt chromometer
C.Pensky-Martens apparatus
D.Lovibond Tintometer
The overall co-efficient of heat transfer is expressed as
A.kcal/hr
B.kcal/m/hr
C.kcal/m2/hr/?C
D.None of the above
The dimensions of the rate constant for nth order homogeneous reaction are
A.(time)-n
B.(time)-1 (concentration)1-n
C.(time)-n (concentration)n-1
D.(time) (concentration)n-1
The capillary rise in water is on account of
A.adhesion being greater than cohesion
B.cohesion being greater than adhesion
C.adhesion being equal to cohesion
D.vapor pressure being small.
The rate constant for N2O5 decomposition reaction is found to be 6.2 x 10-4 S-1. The time required for one-half the N2O5 in a sample to be decomposed is
A.6.2 x 104 s
B.3710 s
C.1513 s
D.1120 s.
For a steady-state mixed reactor the space-time is equivalent to the holding time for
A.constant fluid density systems
B.variable fluid density systems
C.non-isothermal gas reactions
D.gas reactions with changing number of moles.
A gas is termed an ideal gas if it obeys the gas equation PV = RT. When do you expect a gas to show deviation from ideality?
A.At high poressures and low temperatures
B.At low poressures and low temperatures
C.At high poressures and high temperatures
D.At low poressures and high temperatures
In treating turbine water a popular coagulant is
A.calcium sulphate
B.chlorine
C.ferric sulphate
D.iodine
