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प्रश्न
Give two uses of bronze.
उत्तर
Two uses of bronze are:
(i) It is used in the manufacturing of statues, medals etc.
(ii) It is used to make cooking vessels and propellers of ship.
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संबंधित प्रश्न
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Give the principles of electromagnetic separation.
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Name the following:
Name two metals always find in combined state.
Usually ______ ores are subjected to ______ which is done in the absence of air.
Name the process used for the enrichment of sulphide ore.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
