Q4 of 52 Page 77

A number of elements are available in earth’s crust but most abundant elements are ____________.

Aluminium is the most abundant metal on earth by weight(approx 8.3%) and iron is the second most abundant metal on earth by weight(approx 5%)

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2

When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains ____________.

 3

Which of the following reactions is an example of auto-reduction?

 5

Zone refining is based on the principle that ___________.

 6

In the extraction of copper from its sulphideore, the metal is formed by the reduction of Cu2O with