Bauxite is purified by which method?
Wacker's process
Hall's process
Bayer's process
Oxo process
Which one displaces bromine from bromides and iodine from iodides?
Chlorine
Oxygen
Sulphur
Phosphorous
The characteristic shine of metal is called
Colour
Metallic lustre
Glow
Glitters
What metal is used to make electrical wires and cable for domestic or industrial usage?
Sodium
aluminium
potassium
gold
Non-metals react with halogens to give
Ionic halides
Covalent halide
Metallic halide
Neutral halides
If the density of the gangue is less what method is used ?
Gravity seperation method
Magnetic separation method
Froth flotation process
Leaching process
Moderately active metals from their oxide can be obtained by
heating with carbon
heating with aluminium
electrolytic method
strong heating
The oxides of metals are
Acidic
Basic
Neutral
Peroxide
Which is the most important ore of iron?
haematite(Fe2O3)
Magnetite(Fe3O4)
Limonite(Fe2O3.3H2O)
Siderite(FeCO3)
Hydrogen reacts with oxygen to give
Acidic oxide
Basic oxide
Neutral oxide
