The amount of benzene present in pure Benzol is about _______________ percent ?
The amount of benzene present in pure Benzol is about _______________ percent ?
A. 30
B. 50
C. 70
D. 90
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Systemic insecticides________________?
Systemic insecticides________________?A. Are absorbed throughout the plant
B. Kill insects following external bodily contact
C. Are stomach poisons
D. Emit poisonous vapourExothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at _____________ °C ?
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at _____________ °C ?A. 15-30
B. 90-100
C. 250-300
D. < 0______________ is produced using molasses as the starting raw material ?
______________ is produced using molasses as the starting raw material ?A. Methyl alcohol
B. Ethyl alcohol
C. Benzol
D. Dimethyl etherOrdinary glass is not a/an_________________?
Ordinary glass is not a/an_________________?A. Amorphous isotropic material
B. Supercooled liquid
C. Material with sharp definite melting point
D. Electrical insulatorIn the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed ?
In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed ?A. Furnace → converter → absorber
B. Furnace → evaporator → absorber
C. Furnace → converter → evaporator
D. Converter → furnace → absorber______________ is a thermosetting plastic?
______________ is a thermosetting plastic?A. Polyvinyl chloride
B. Polythene
C. Bakelite
D. Teflon