Which non-metal acts as a reducing agent?
Chlorine
Sulphur
Carbon
Phosphorous
Which is used for making statues,coins,utensils,bells etc?
Bronze
Brass
Alnico
Solder
Which is the most commonly used ore of aluminium?
Bauxite
corundum
cryolite
feldspar
Metals except sodium and potassium have
High densities
Low densities
Different colours
Low tensile strength
Which is used for making cutlery,utensile,ornamental pieces and some other instrument and apparatus?
Steel
Stainless steel
Nichrome
The process of extracting pure metals from their ores is called
Metallurgy
Malleability
Ductiliy
Concentration
The process of heating an ore strongly in the absence of air or in the presence of very limited quantity of air is called
Leaching
Magnetic separation method
Calcination
Forth-flotation method
The removal of the unwanted earthly materials from an ore is called
Crushing and pulverisation of the ore
Concentration of ore
Extraction of metal
Refining of metal
Which is used for making aeroplane,spacecraft seaships and pressure cookers?
Magnalium
Duralumin
alnico
bronze
Which is the most important ore of iron?
haematite(Fe2O3)
Magnetite(Fe3O4)
Limonite(Fe2O3.3H2O)
Siderite(FeCO3)