Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
Television
Refrigerator
Tube light
Cooking gas
Balloons are filled with
nitrogen
helium
oxygen
argon
Which of the following does not contain a coinage metal?
Silver and Gold
Zinc and Gold
Copper and Silver
Copper and Gold
Which metal pollute the air of a big city?
Copper
Chromium
Lead
Cadmium
Bell metal is an alloy of
nickel and copper
zinc and copper
brass and nickel
tin and copper
Water is a good solvent of ionic salts because
it has a high specific heat
it has no colour
it has a high dipole moment
it has a high boiling point
Which of the following is not an isotope of hydrogen?
Tritium
Deuterium
Protium
Yttrium
The main constituents of pearls are
calcium oxide and ammonium chloride
calcium carbonate and magnesium carbonate
aragonite and conchiolin
ammonium sulphate and sodium carbonate
Amalgams are
highly coloured alloys
alloys which contain mercury as one of the contents
alloys which have great resistance to abrasion
alloys which contain carbon
Which of the following is the lightest metal?
Mercury
Lithium
Silver