Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?
Silicon
Oxygen
Carbon
Calcium
Correct Answer :
B. Oxygen
Related Questions
Cholesterol is
a carbohydrate
a protein
a lipid
a hormone
The substance preserved under water is
potassium
sodium
red phosphorus
white phosphorus
An essential condition for rusting is
high temperature
light
moisture
dry air
The value of Avogadro Number is
6.023 x 1022
1 x 10-14
cl 6.056 x 10-6
6.023 x 1023
Concrete is a mixture of
cement an limestone
cement and sand
cement and gravel
cement, sand and gravel
The neutron was discovered by
Chadwick
Madam Curie
Becquerel
Aston
Calomel is
lead chloride
mercurous chloride
mercuric chloride
calcium sulphate
Which of the following is not an alloy of copper?
Bronze
Brass
Solder
Gun metal
Stainless steel contains steel and
manganese
vanadium
nickel
chromium
Biogas is obtained during
decomposition of petrol
fermentation of animal and plant waste
destructive distillation of coal
electrolysis of water
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'
In addition to nitric acid, another acid which may render iron passive is
acetic acid
oxalic acid
chromic acid
citric acid
The foul odour of gasoline is due to
pyridine
hydrogen sulphide
cacodyl
carbylamines
The kinetic energy of gas molecules
is unaffected by temperature variations
decreases with increase of temperature
increases with decrease of temperature
increases with increase of temperature
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.
The simplest hydrocarbon is
benzene
methane
ethane
butane
Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the
Law of Multiple Proportions
Law of Definite Proportions
Law of Conservation of Mass
Law of Reciprocal Proportions
Cupellation is used in the purification of
Lead
Tin
Silver
Gold
Clark's method for removal of temporary hardness in water uses
calcium hydroxide
washing soda
calcium chloride
zeolite
Which of the following is not a metal?
Lithium
Helium
Sodium
Cobalt
Suspended impurities in water are effectively removed by
adding milk of lime
filtering through sand
adding filter alum
chlorination
Rusting is a special case of corrosion applied to
nickel
tin
iron
chromium
Diamonds are weighed in
grams
pounds
carats
tons
The main constituent of gobar gas is
methane
nitrogen
carbondioxide
ethylene
Which among the following is a metalloid?
Tin
Silver
Iodine
Arsenic
The purest form of carbon is
animal charcoal
coal
wood charcoal
sugar charcoal
Vinegar is an aqueous solution of
oxalic acid
citric acid
acetic acid
hydrochloric acid
Plastics are synthetic
rubbers
fibres
resins
sugars
Which of the following is not a chemical change?
Burning of magnesium ribbon in air
Distillation of water
Heating of cane sugar
Setting of cement
A common rodenticide is (Rat Poison)
malathion
parathion
zinc phosphide
diuron