Triple superphosphate contains
A.16-20% P2O5
B.42-45% P2O5
C.70-75% P2O5
D.90-92% P2O5
Category: Chemical Engineering Mcqs
In nuclear reactions
A.only the mass number is conserved
B.only the atomic number is conserved
C.the mass number and the atomic number both are conserved
D.neither the atomic number nor the mass number is conserved
The oxygen for fuel combustion comes from the air which consists of about
A.21% oxygen and 79% nitrogen by volume
B.21% oxygen and 79% nitrogen by weight
C.79% oxygen and 21% nitrogen by volume
D.79% oxygen and 21% nitrogen by weight
Which is not the assumption in Fourier’s equation of heat conduction?
A.Homogeneous substance
B.Steady heat flow
C.Constant temperature difference
D.Thermal conductivity independent of temperature
E.Uniform area of cross-section
Emissivity and absorptivity of a surface are equal for radiation
A.in ultraviolet region
B.infrared region
C.with equal temperature and wavelength
D.in radio frequency range
If a solution has pH = 2. it is
A.highly acidic
B.weakly acidic
C.neutral
D.alkaline
Which of the following statements is wrong for deuterium and tritium?
A.Both have same number of protons
B.Both have same number of electrons
C.Both have same number of neutrons
D.Both form neutral exides
The solution will be acidic when
A.pH > 7
B.pH = 7
C.pH ? 7
D.pH < 7
If the pH of a solution changes by 1 unit the corresponding change in the hydrogen ion concentration of the solution is
A.2.3 times
B.10 times
C.23 times
D.100 times
In a distillation operation total reflux requires
A.minimum number of plates
B.infinite number of plates
C.minimum reboiler and condenser load
D.that the flow of fresh feed must continue
