A form of carbon which is a good lubricant is
diamond
coke
graphite
charcoal
Correct Answer :
C. graphite
Related Questions
Ozone occurs in the upper layers of air in the atmosphere because
it is lighter than air
in the lower layers it becomes unstable
ultra-violet light is present only in the upper layers
it mixes freely with O2 in the upper layers
Riboflavin deficiency causes
tongue inflammation
pellagra
night blindness
anaemia
An example of stimulant fertilizer is
gypsum
urea
potassium nitrate
ammonium phosphate
Iron is rendered passive by
conc. H2SO4
conc. HCl
conc. HNO3
acetic acid
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'
Which of the following is not a supporter of combustion?
Oxygen
Air
Hydrogen
Chlorine
The modern system of symbols was evolved by
Dalton
Cavendish
Avogadro
Berzelius
The main constituent of gobar gas is
methane
nitrogen
carbondioxide
ethylene
Compounds of nitrogen with metals are called
nitrates
nitrites
hyponitrates
nitrides
In surgical operation, the anaesthetic commonly used nowadays is
iodoform
chloroform
nitrous oxide-ether mixture
chloroform-nitrous oxide mixture
The chemical name of aspirin is
acetamide phenol
malonyl urea
aminosalicylic acid
acetyl salicylic acid
Gases have
a definite shape but not volume
a definite volume and shape
a definite volume but not shape
neither definite volume nor shape
The raw materials required for the manufacture of glass are
silica, sodium nitrate and soda ash
silica, limestone and sodium nitrate
silica, sodium oxide and limestone
silica, soda ash and limestone
The most abundant noble gas present in air is
neon
argon
helium
krypton
Oxalic acid is used in the manufacture of
tincture iodine
paints
ink
aerated water
When ants bite, they inject
glacial acetic acid
methanol
formic acid
stearic acid
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
Galvanising is coating Iron with
nickel
zinc
chromium
copper
Acute diabetes patients smell of
acetone
ether
ethyl alcohol
methyl alcohol
Which of the following la a very good supporter of combustion?
Carbon monoxide
Oxygen
Nitrogen
Hydrogen
Tincture iodine is a solution of
iodine in potassium iodide
iodine in alcohol
iodine in water
iodine in carbon disulphide
High temperature thermometers use
sodium amalgam
an alloy of sodium and potassium
silver amalgam
calcium amalgam
A burning substance which continues to burn in a jar of carbon dioxide is
zinc
red phosphorus
magnesium
sulphur
Dry Ice is
solid carbon dioxide
liquid oxygen
liquid hydrogen
liquid. Chlorine
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
What is 'oxygen mixture'?
A mixture of potassium nitrate and carbon
A mixture of ammonium chloride and sodium nitrate
A mixture of potassium chlorate and manganese dioxide
A mixture of ammonium nitrate and charcoal
Rusting is a special case of corrosion applied to
nickel
tin
iron
chromium
Calomel is
lead chloride
mercurous chloride
mercuric chloride
calcium sulphate
In the making of jewels, gold is usually mixed with
zinc
tin
copper
aluminium
In the mouth, starch is converted into ______ by the action of saliva.
sucrose
glucose
fructose
mannose