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1.
Which of the elements listed below shows allotropic forms?
2.
Following method is not used for extraction of Al
3.
Indian saltpetre is:
4.
Poling process is used:
5.
Sperrylite is:
6.
The substance added in water in the forth floatation process is
7.
The region in which metals are found in earth is called:
8.
In the manufacture of iron from haematite, lime stone is added to act as:
9.
On heating a mixture of 
and 
, we get:
and , we get:
10.
Cassiterite is an ore of