Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.
three
four
one
five
Correct Answer :
A. three
Related Questions
Oil of winter green contains
acetone
ether
acetic acid
methyl salicylate
A metal which is extracted by thermal reduction is
nickel
aluminium
mercury
calcium
The ore of iron is
Dolomite
Magnetite
Bauxite
Anglesite
Vinegar is an aqueous solution of
oxalic acid
citric acid
acetic acid
hydrochloric acid
Grape sugar is another name for
glucose
fructose
sucrose
maltose
If people sleep in closed rooms where charcoal fire is burning, they die due to
carbon monoxide
carbon dioxide
methane
phosgene
Which one of the following is used in dry cleaning of garments?
asphalt
naphtha
diesel oil
lubricating oil
On chemical analysis, a bottle cork is found to contain primarily
proteins
carbohydrates
tannins
lipids
Glass articles are annealed so that
they may appear better
they can resist the action of acids and alkalies
they lose their brittleness
they can withstand temperature shocks
Consider the following statements: Hard water is not suitable for
1) drinking
2) washing clothes with soap
3) use in boilers
4) irrigating crops
Which of these statements are correct?
1 and 3
2 and 3
1, 2 and 4
1, 2, 3 and 4
Mortar contains cement and sand in the ratio of
1 : 1
1 : 2
2 : 3
1 : 3
The process of heating steel to bright red heat and cooling suddenly by plunging it into water is known as
annealing
hardening
quenching
tempering
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
A substance used as a fire-extinguisher under the trade name of Pyrene is
carbon dioxide
chloroform
carbon tetrachloride
bleaching powder
Rayon la made from
cotton
wool
cellulose
silk
The presence of dust particles in air serves
as a nucleus to condense water vapour resulting in rain
to maintain the average density of air
to minimise the inflammatory nature of oxygen
to protect the inhabitants of the earth from the effects of ultra violet rays.
Rain water collected after a shower la very pure because
the initial showers wash the atmosphere free from most of the impurities
it contains desirable salts like sodium chloride and ammonium nitrate
it dissolves the gases in the atmosphere like ozone which are good for health in small quantities
it is supposed to be 'heaven sent'
The addition of a neutron to the nucleus of an atom
increases the atomic mass of the atom
decreases the atomic mass of the atom
increases the charge on the nucleus
decreases the charge on the nucleus
The principle involved in dialysis, a treatment administered to patients with affected kidneys is
Cataphoresis
Osmosis
Dehydration
Diffusion
Cinnabar is an ore of
lead
zinc
mercury
chromium
Which of the following is not a physical change?
Distillation of water
Action of heat on potassium chlorate
Powdering of glass
Burning of an electric lamp
Which of the following cannot be used as fuel?
Gasoline
Kerosene
Sulphuric acid
Alcohol
The gas evolved when ammonium nitrate is heated is
nitrogen
nitric oxide
nitrogen peroxide
nitrous oxide
Galvanising is coating Iron with
nickel
zinc
chromium
copper
The value of Avogadro Number is
6.023 x 1022
1 x 10-14
cl 6.056 x 10-6
6.023 x 1023
Which one of the following is not radioactive?
Astatine
Francium
Tritium
Zirconium
Nitrous oxide used as anaesthetic is usually mixed with
ethyl alcohol
chloroform
oxygen
methyl alcohol
When ants bite, they inject
glacial acetic acid
methanol
formic acid
stearic acid
Fructose is also called
dextrose
fruit sugar
beet sugar
blood sugar
Smelling salt contains
ammonium chloride
ammonium carbonate
ammonium sulphate
potassium nitrate