Copper is purified by
poling
tempering
calcination
galvanising
Correct Answer :
A. poling
Related Questions
A mixture of carbon monoxide and hydrogen is
coal gas
producer gas
water gas
gobar gas
Which among the following gases present in the air discolours brass nameplates?
Hydrogen Sulphide
Nitrogen
Carbon-di-oxide
Oxygen
Brass contains
copper and tin
aluminium and magnesium
copper and zinc
copper, tin and zinc
Refined petroleum is decolourised by
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Galvanising is coating Iron with
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zinc
chromium
copper
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Lead
Tin
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Ozone occurs in the upper layers of air in the atmosphere because
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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
Physico-chemical characteristics of water in water sources undergo changes due to
aquatic macrophytes
aquatic fungi
effluents
evapotranspiration
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iodoform
bleaching powder
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An acid which is used as a preservative for pickles is
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tartaric acid
acetic acid
Quick lime has the formula
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Which of the following elements is not required for the healthy growth of plants?
Nitrogen
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Potassium
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Soda-water contains
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carbonic acid
sodium hydroxide
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gain of oxygen
removal of hydrogen
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they can resist the action of acids and alkalies
they lose their brittleness
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The soaps used in shaving cream are
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soft soaps
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copper sulphate, lime and water
thio-urea and lime
copper sulphate and thio-urea
Penicillin was discovered by
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Sir JJ Thomson
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Sir John Russel
One of the ingredients of the paste on the side of a match box is
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phosphorus trichloride
phosphorus trisulphide
phosphorus trioxide
Which of the following is a regenerated fibre?
Terylene
Rayon
Nylon
Silk
The ore of iron is
Dolomite
Magnetite
Bauxite
Anglesite
Lunar caustic is
calcium sulphate
ammonium chloride
caustic soda
silver nitrate
Apart from lead tetra-ethyl, the other compound used as antiknock is
n-heptane
n-octane
iso-heptane
iso-octane
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
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A mixture of naphthalene and sand is separated by
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using a magnet
sublimation
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chlorination
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a dye
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the manufacture of dyes
refrigerators
the preparation of drugs
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Activated charcoal
Anthracite coal
Diamond
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tine
magnesium
zinc
copper