Radioactive decay is
A.a physical change
B.a chemical change
C.a nuclear change
D.none of the above
Category: Chemical Engineering Mcqs
Which of the following devices of particulate collection is the least efficient?
A.Cyclone separator
B.Electrostatic precipitator
C.Fabric filter
D.Wet scrubber
The enthalpy (H) of any system is defined by the mathematical expression
A.H = U-PV
B.H = U + PV
C.H = V + PU
D.H = U + RT
For identical feed compostion and flow rate, N plug flow reactors in series with a total volume V gives the same conversion as a single
A.plug flow reactor of volume V
B.CSTR of volume V
C.Plug flow reactor of volume V/N
D.plug flow reactor of volume NV.
Corrosion
A.involves exchange of electrons in electrochemical corrosion only
B.involves exchange of electrons in chemical corrosion only
C.involves exchange of electrons both in electrochemical and chemical corrosion only
D.is a physical phenomenon
Ammonium nitrate which is used as fertilizer contains about
A.35% N
B.25% N
C.46% N
D.82% N
In the manufacture of urea biuret (NH2CONHCONH2) formation is kept at minimum (<1%) because
A.it is an explosive
B.it is a compound which is detrimental to germinating seeds and toxic to animals
C.it decomposes urea into carbon dioxide nitrogen and water
D.its nitrogen content is only 4 wt %
Potassium carbonate is not prepared by the Solvy process because
A.potassium bicarbonate is unstable
B.potassium bicarbonate is soluble is water
C.potassium bicarbonate is soluble in ammonium chloride and potassium chloride solutions
D.potassium bicarbonate does not decompose on heating
Which of the following statements is incorrect?
A.A catalyst can be recovered chemically unchanged at the end of a chemical reaction
B.A catalyst is incapable of reacting with any one of the reactants
C.Digestion of food in animal body is a catalysed reaction
D.A catalyst lowers the activation energy of the reacting molecules.
Smoking tendency of paraffins present in kerosine
A.remains constant with change in molecular weight
B.increases with increase in molecular weight
C.decreases with increase in molecular weight
D.none of the above
