section 9 Flashcards
Pick out the wrong statement.
a. Pasteurisation of milk involves moderate
heating followed by cooling.
b. Bakeries and breweries make use of yeasts.
c. Enzyme is a complex nitrogenous
compound.
d. Oils and fats are alkaloids.
d
Which of the following, when pyrolysed,
produces perchloro-ethylene?
a. Ethylene dichloride
b. Chlorobenzene
c. Carbon tetrachloride
d. Chlorinated paraffin
c
Chemical name of aspirin (an analgesic drug) is
a. acetylsalicylic acid
b. nictonic acid
c. calcium acetate
d. methyl salicylate
a
Which is the most efficient absorbent for SO3 out
of the following?
a. 20% oleum
b. 65% oleum
c. 78%H2SO4
d. 98%H2SO4
d
Coal tar is used as a
a. binding material for coal briquettes.
b. fuel in rotary kiln.
c. binder in making carbon electrodes.
d. all (a), (b) and (c).
d
Caprolactum (a raw material for nylon-6
manufacture) is produced from
a. phenol
b. naphthalene
c. benzene
d. Pyridine
c
The purpose of adding Na2CO3 to water of low
alkalinity is to
a. permit the use of alum as a coagulant.
b. increase the softening capacity of zeolite.
c. facilitate easy regeneration of zeolite.
d. all (a), (b) and (c).
a
Ca(OH)2 is called
a. quicklime
b. slaked lime
c. limestone
d. Gypsum
b
Percentage of uranium in carnotite ore found in
Jadugoda (Jharkhand) is about
a. 0.1 to 0.5
b. 1 to 5
c. 5 to 10
d. 15 to 25
a
Potassium is kept & transported under
a. water
b. liquid ammonia
c. kerosene oil
d. Alcohol
c
The metallic aluminium is obtained from pure
alumina in the presence of fused cryolite by
a. electrolysis
b. electrolytic reduction
c. electrolytic oxidation
d. none of these
b
Bakelite is chemically known as
a. polyvinyl chloride (PVC)
b. polybutadiene
c. phenol formaldehyde
d. Polyurathane
c
Which of the following is a co-product during
the manufacture of caustic soda by electrolysis of
brine?
a. Na2CO3
b. NaHCO3
c. H2
d. none of these
c
Phthalic anhydride is made by the
a. oxidation of naphthalene.
b. oxidation of benzene.
c. dehydrogenation of ethyl benzene.
d. none of these.
a
RDX (an explosive), which is more sensitive but
less toxic than TNT, is chemically
a. cyclo trimethylene trinitramine.
b. trinitro resorcinol.
c. cyclo tetramethylene tetranitramine.
d. trinitro benzene.
a
Raw material used in alcohol distilleries in India
is
a. molasses
b. benzol
c. methylated spirit
d. none of these
a
Oil produced by solvent extraction
a. has low free fatty acid content.
b. is odourless.
c. both (a) &(b).
d. neither (a) nor (b).
d
High acid value of an oil or fat is an indication
of
a. storage under improper conditions.
b. absence of unsaturation.
c. its smaller molecular weight.
d. none of these.
a
Yeast is used in the manufacture of
a. pencillin
b. antibiotics
c. wine
d. pasteurised milk
c
- Liquefaction of gases can not be done by
a. exchange of heat with colder stream.
b. adiabatic expansion through a throttle valve
(Joule-Thomson expansion).
c. merely compressing it beyond critical
pressure.
d. adiabatic expansion against a piston or in a
turbine.
c