A non-metal which is good conductor of electricity is
diamond
graphite
Gold
Platinum
Silver articles become black on prolonged exposure to air. This is due to the formation of
AgCN
Ag2O
Ag2S
Ag2S and AgCN
Generally non-metals are not lustrous. Which of the following non-metals is lustrous?
Sulphur
Phosphorus
Nitrogen
Iodine
The metal is a liquid at room temperature
Potassium
Zinc
Mercury
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
Brass
Gun metal
Amalgam
Steel
The ability of metals to be drawn into thin sheets is known as
Ductility
Malleability
Sonorosity
Conductivity
Which metal is used as an electrode in dry cell?
Iron
Aluminium
Which of the following is not true of metals?
Metals are good conductors of electricity
Metals are malleable and ductile.
Metals form non-polar covalent compounds
Metal will have 1 or 2 or 3 electrons in their valence shell
Pine oil used in froth floatation process acts as a
water repellant
frother
Calcinator
Roaster
Food cans are coated with tin and not with zinc because
Zinc is costlier than tin
Zinc has higher melting point than tin
Zinc is more reactive than tin
Zinc is less reactive than tin