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Thursday, 20 October 2016

ICSE CHEMISTRY CLASS 10 -Metallurgy - Important Questions

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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