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1.
Lepidolite is an ore of:
2.
Chalcogens are:
3.
In the Hall's process for extraction of 
, the ore is fused with:
, the ore is fused with:
4.
Antimony occurs mainly in form of:
5.
An important ore of iron is
6.
Barytes, an ore is:
7.
Thermite is a mixture of
8.
When lime stone is heated, carbon dioxide is given off. This operation in metallurgy is known as:
9.
Heating mixture of 
and 
will give
and will give
10.
and 
are two allotropes of an element. One gram of will differ from one gram of in:
and are two allotropes of an element. One gram of will differ from one gram of in: