Which one of the following reactions is not an exothermic
A.Absorption of sulphur troixide by 98.5% sulphuric acid
B.Oxidation of sulphur trioxide
C.Oxidation of sulphur to sulphur dioxide
D.Thermal dissociation of iron pyrites
Category: Chemical Technology Mcqs
Hydrogen peroxide is concentrated by
A.distillation at atmospheric pressure
B.crystallization
C.dehydration
D.vacuum distillation
Oleum is
A.a misture of conc. H2SO4 and oil
B.sulphuric acid which gives fumes of sulphur dioxide
C.sulphuric acid saturated with sulphur trioxide
D.a mixture of sulphuric and nitric acid.
Nitrogen gas is used
A.as protective atmosphere to prevent oxidation in metal working and food preservation
B.for welding
C.for cutting of metals
D.as refrigerant
The principal constituent of Pyrex glass is
A.Zn
B.B
C.Pb
D.Ce
Acetylene is manufactured by
A.reacting calcium carbide with liquid water
B.Sachsse process
C.Wulff process
D.all of these ansers
The form of sulphur which is the most stable at ordinary temperature is
A.Monoclinic
B.plastic
C.rhombic
D.flowers of sulphur
The catalyst used in the manufacture of sulphuric acid by contact process is
A.iron
B.aluminium oxid
C.nickel
D.vanadium pentoxide
The raw materials for the manufacature of calcium carbide are
A.limestone and coke
B.limestone and slaked lime
C.limestone and sand
D.limestone and caustic soda
When sulphur dioxide is passed through a golution of hydrogen sulphide in water
A.sulphuric acid is formed in solution
B.sulphurous acid is formed in solution
C.sulphur is precipitated
D.no change is observed
