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Question 1
What is the name of the purification process used for metals with a low melting point?
Question 2
Which of the following metals cannot be extracted by self-reduction?
Question 3
What was the basic idea behind keeping the elements in groups of a periodic table?
Question 4
Which of the following sets of elements has the same valency?
Question 5
Calcination is the process in which heating of ore takes place in-
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NDA & Other ExamsJan 31NDA & Other Exams
