(a) Write the name and formula of the main ore of aluminium.(b) What is alumina? Which reducing agent is used for the reduction of alumina?(c) Draw a diagram of the electrolytic cell used in the reduction of alumina. Label anode and cathode on it.(d) Why is alumina dissolved in cryolite?OR(a) What is an alloy? How is an alloy made?(b) Name an alloy(i) which has a lower melting point than its constituents(ii) which is more hard, tough and strong than its constituents(c) Name the constituents of the alloy ‘Magnalium’. Write its two uses.
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the homogenous mixture formed by mixing a metal with other metals or nonmetals in certain proportion is called an alloy. bronze is an alloy
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a)Alloy is a mixture of two or more metals.
Alloy is artificially manufactured by melting and mixing different metals in a specific amount and manner.
b) i) Bismuth is an alloy which is made out of Lead and Tin,but the melting point of Bismuth is less than both Lead and Tin.
ii)Carbon is steel is made out of iron, manganese, tungsten, boron etc.
And the hardness of the steel is more than it's composition metals.
c)Magnalium is made out of aluminium and magmesium.
It is used for making mirror and other reflective objects.
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