The lowest layer of atmosphere is called
A.ionosphere
B.troposphere
C.stratosphere
D.exosphere
Category: Chemical Engineering Mcqs
Acids are substances that yield H+ in acqueous solutions while bases yield OH?ions. In a neutral solution
A.there are no H+
B.there are no OH?
C.H+ and OH- are present in very small but equal concentration
D.[H+] + [OH-] = 1
A system in which there may exchange energy but not mass is known as
A.open system
B.closed system
C.isolated system
D.insulated system
Dropwise condensation occurs on a
A.Glazed surface
B.Smooth surface
C.Oily surface
D.Coated surface
E.None of the above
Metals are good conductors of heat because
A.They contain free electrons
B.Their atoms are relatively far apart
C.Their atoms collide frequently
D.They have reflecting surfaces
E.None of the above
Which one of the following will have least value of thermal conductivity?
A.Copper
B.Silver
C.Glass
D.Water
E.Air
The electric furnace is used for the manufacture of elemental phosphorus from phosphate rock. The electrodes are made of
A.carbon
B.aluminium
C.zinc
D.copper
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter when
A.film diffusion is the controlling resistance
B.chemical reaction is the controlling resistance
C.diffusion through ash layer is the controlling resistance.
The economic life of a small chemical plant is
A.usually more than a large chemical plant
B.usually much more than a large chemical plant
C.usually much less than a large chemical plant
D.always equal to a large chemical plant
Cementite
A.is a compound of iron and carbon
B.is characterized by an orthorhombic crystal structure
C.has the approximate chemical formula Fe3C
D.all of these answers
