ICSE CHEMISTRY CLASS 10 Important Questions in Metallurgy
a) Give
reason:
i) In the extraction of
Aluminium from Bauxite further refining is not reqired.
ii) Aluminium oxide is
reduced by electrolysis but not using reducing agents.
iii) Aluminium powder
is used in paints.
iv) Zinc is used in the
alloys like Bronze and Brass.
b) i)
Carbon is added to Iron in to impart _______(hardness/lustre).
ii) The substance added to the ore to get rid of
impuries is called ______Matrix/Flux.
iii) In thermite welding Aluminium acts as a/an ________ oxidizing /reducing agent.
iv) Metals _______lose/gain electrons and form cations.
v)
____________(sulphide/carbonate) ores
are concentrated by froth flotation method.
vi) Haematite
is an ore of ____________(Aluminium/Iron).
c)
Name the following.
i)
The non metal which is used in alloying.
ii)
The rocky impurities associated with an ore.
i)
The metal which is a poor conductor of
electricity:
A)
Copper B) Aluminium C) Gold D) Tungsten
ii)
The composition of solder:
A)
Pb+Cu B) Pb+Sn C) Pd+Sn D) Zn+Cu
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