The depletion of the ozone layer in the upper atmosphere is due to -extensive use of
dichloro-phenoxy-acetic acid
superphosphate of lime
chlorofluorocarbons (CFC)
dichloro-diphenyl-trichloro-ethane
Correct Answer :
C. chlorofluorocarbons (CFC)
Related Questions
Invar, used for making pendulums is an alloy of steel with
tungsten
nickel
manganese
chromium
An antipyretic is a drug used
in the treatment of malaria
to relieve sleepiness
to induce sleep
to lower body temperature
An example of stimulant fertilizer is
gypsum
urea
potassium nitrate
ammonium phosphate
The chemical name of aspirin is
acetamide phenol
malonyl urea
aminosalicylic acid
acetyl salicylic acid
The pH or pure water is nearly 7.0 It will increase on the addition or
hydrochloric acid
ammonia
cane sugar
common salt
Riboflavin deficiency causes
tongue inflammation
pellagra
night blindness
anaemia
The alloy added in the preparation of steel contains
Fe and C
Mn and C
Fe and Mn
Fe, Mn and C
A valuable by-product in the manufacture of soap is
stearic acid
sodium hydroxide
palmitic acid
glycerol
PAS is a drug used In the treatment of
tuberculosis
cancer
typhoid
malaria
Hard water does not lather well with soap because
it contains carbonates of calcium and magnesium
it contains sodium chloride
it is highly coloured
it contains suspended impurities
The noble gas which is present in microscopic quantities in air is
xenon
krypton
argon
helium
Rooms in places infected by plague are disinfected using
bleaching powder
iodoform
sulphur dioxide
chlorine
The earliest name given to nitrogen was
dephlogisticated air
azote
inflammable air
marine acid air
Quick lime has the formula
CaO
Ca(OH)2
NaOH
Na2CO3
Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because otherwise
it becomes coloured
it gets evaporated in air
it gets oxidised to phosgene
it gets decomposed to chloropicrin
Galvanised iron sheets are protected from rusting due to the presence of a layer of
lead
chromium
zinc
tin
The purest form of carbon is
animal charcoal
coal
wood charcoal
sugar charcoal
Which of the following can absorb gases quickly?
Activated charcoal
Anthracite coal
Diamond
Graphite
Solid carbon dioxide is used
as a drying agent
as a refrigerant
as an antiseptic
as a bleaching agent
A hormone which contains iodine is
adrenalin
glucagon
epinephrin
thyroxin
Which or the following electrolysis?
Aluminium
Copper
Zinc
Iron
Which of the following is a Bleaching agent?
Potassium chlorate
Hydrogen peroxide
Copper sulphate
Silver Nitrate
Dust particles in the air of large industrial cities are removed by
Sedimentation
Electrophoresis
Tyndall effect
Brownian movement
Calamine is a ore of
tine
magnesium
zinc
copper
Artificial diamonds were produced by
Moissan
Davy
Faraday
Marie Curie
A metal which occurs 'free' in nature is
gold
zinc
tin
molybdenum
The commonest ore of aluminium is
cryolite
bauxite
malachite
azurite
Tincture iodine is
a disinfectant
an analgesic
a hypnotic
a dye
The compound of iron used in the manufacture of blue-black ink is
ferric chloride
ferric sulphate
ferric thiocyanate
ferrous sulphate
Galvanising is coating Iron with
nickel
zinc
chromium
copper