Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about ______________ °C ?
(A) -83
(B) -183
(C) -196
(D) -218
The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is _________________?
(A) Dilute H2SO4
(B) Oleum
(C) Ultraviolet light
(D) None of these
Pure rectified spirit contains about _________________ percent alcohol?
(A) 45
(B) 70
(C) 95
(D) 99.5
Styrene is produced from ethyl benzene by the process of________________?
(A) Dehydrogenation
(B) Oxidation
(C) Alkylation
(D) Dehydration
White phosphorous is stored under water, because __________________?
(A) It does not react with water
(B) It is poisonous
(C) Its kindling temperature in dry air is very low
(D) It is unstable
Paper pulp produced by Kraft/sulphate process is__________________ ?
(A) Bleached easily
(B) Dull white in color
(C) Strong fibrous
(D) Dark colored
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
Oxidation of SO2 to SO3 is favoured by______________________?
(A) Low temperature and low pressure
(B) Low temperature and high pressure
(C) High temperature and low pressure
(D) High temperature and high pressure
Which of the following contains least amount of N2 ?
(A) Coke oven gas
(B) Blast furnace gas
(C) Producer gas
(D) Water gas (blue gas)
Which of the following is not responsible for causing permanent hardness of water ?
(A) Ca(HCO3)2
(B) CaCl2
(C) MgCl2
(D) None of these