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प्रश्न
Sulphide ores : Roasting : : Carbonate ores : _______
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उत्तर
Sulphide ores : Roasting : : Carbonate ores : Calcination
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संबंधित प्रश्न
Name two metals which occur in nature in free state as well as in combined state.
Name three other metals which are extracted in a manner similar to sodium.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Name the electrode at which aluminium metal is produced.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
How many valence electrons are present in non- metals?
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Which one of the following is not true of metal :
Metals are good conductors of electricity.
Name the following:
A steel grey coloured solid non-metal.
State three objectives achieved during the roasting of ores.
Define calcination.
Write the molecular formulae of the following compound.
Fluorspar
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
An alloy is
Care must be taken while diluting concentrated nitric acid with water. Why?
