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NEET 2020: General Principles and Processes of Isolation of Elements

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Question 1

Haematite ore is concentrated by:

Question 2

During the extraction of aluminium, CaF₂ is added to the molten mixture of cryolite and alumina because

Question 3

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

Question 4

"Metals are usually not found as nitrates in their ores". Out of the following two (a and b) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.

Question 5

In Ellingham diagrams of ∆_fG (metal oxide) versus T, which of the following graphs has negative slope?

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Jul 9NEET & AIIMS