Assertion: Metals have the quality of reflecting light from their surface and can be polished.
Reason: Non-metals are not usually lustrous.
Assertion : Usually the sulphide ore is converted to oxide before reduction.
Reason : Reduction of oxides occurs easier.
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Assertion : Iron pyrite is not useful in the extraction of Fe.
Reason : SO2 polluting gas is produced during extraction.
Assertion : Zinc carbonate is heated strongly in the presence of air to form zinc oxide and carbon dioxide.
Reason : Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert into metal oxide.
Assertion : In the metallurgy of Al, purified Al2O3 is mixed with Na3AlF6 or CaF2.
Reason : It lowers the melting point of the mixture and brings conductivity.
Assertion : Gold is isolated from other impurities by the Arndt forrest cyanide process.
Reason : The cyanide which is used here dissolve all possible impurities.
Assertion : Magnesium chloride is an ionic compound.
Reason : Metals and non-metals react by mutual transfer of electrons.
Assertion : Zinc can easily displace Copper on reacting with a solution of copper sulphate.
Reason : Copper is more reactive metal as compared to Zinc.
Assertion : Zinc oxide amphoteric in nature.
Reason : Zinc oxide reacts with both acids and bases.
Assertion : Bronze is an alloy of lead and tin.
Reason : Alloys are a heterogeneous mixture of metals with other metals and non-metals.