Radioactive decay is a
A.zero-order reaction
B.first-order reaction
C.second-order reaction
D.third-order reaction
Category: Chemical Engineering Mcqs
The water in volume per cent used in the electrical desalting of crude oils varies normally between
A.3 and 8
B.20 and 30
C.10 and 15
D.15 and 20
If the atomic weight of an element isA the correct expression is
A.e = A-p
B.p = A-n
C.n = A + e
D.A = n-e
The electric furnace is used for the manufacture of elemental phosphorus from a phosphate rock. The fused section of the furnace where the reduction to elemental phosphorus takes place is maintained at
A.500-600?C
B.800-900?C
C.1400-1450?C
D.2000-2100?C
A reading of 100% on the explosivementer means that the concentration of combustible gas is
A.less than the lower limit of explosibility
B.equal to the lower limit of explosibility
C.higher than the lower limit of explosibility
D.both (b) and (c)
The allotrope of sulphur which is insoluble in carbon disulphide is
A.monoclinic suphur
B.rhombic sulphur
C.milk of sulphur
D.plastic sulphur
Corrosion resisting properties of cast iron are very much improved by the addition of 12-15 per cent of
A.vanadium
B.tungsten
C.silicon
D.phosphorus
Cetane number of hepta methl nonane is taken to be
A.0
B.15
C.100
D.42
The number of neutrons in the nucleus 92U235 is
A.92
B.146
C.143
D.327
