Match the entities in Column I with the corresponding processes in Column II.a)P-4, Q-2, R-3, S-1b)P-2, Q-4, R-3, S-1c)P-3, Q-4, R-1, S-2d)P-4, Q-1, R-2, S-3Correct answer is option 'B'. Can you explain this answer?

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Match the entities in Column I with the corresponding processes in Column II.

a)
P-4, Q-2, R-3, S-1
b)
P-2, Q-4, R-3, S-1
c)
P-3, Q-4, R-1, S-2
d)
P-4, Q-1, R-2, S-3

Correct answer is option 'B'. Can you explain this answer?

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Metallurgical Engineering - MT 2016 GATE Paper (Practice Test)

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Match the entities in Column I with the corresponding processes in Col...

Correct Answer :- b

Explanation : a) Sodium ethyl xanthate is used in the mining industry as a flotation agent. A closely related potassium ethyl xanthate (KEX) is obtained as the anhydrous salt.

b) Thiobacillus ferrooxidans is a gram-negative, highly acidophilic (pH 1.5 to 2.0), autotrophic bacterium that obtains its energy through the oxidation of ferrous iron or reduced inorganic sulfur compounds.

c) A hydrocyclone is a classifier that has two exits on the axis: one on the bottom (underflow or reject) and one at the top (overflow or accept). The underflow is generally the denser or coarser fraction, while the overflow is the lighter or finer fraction.

d) During an anode effect the normal reactions that produce aluminum are interrupted and other electrochemical reactions take place with the formations of gases CO, CF4 and C2F6. These gases forms bubbles that adhere to the anode bottom, creating an electrical insulating layer which is the reason why the voltage of the cell increases up to 10 – 50 volts and even more. The maximum voltage reached during the anode effects depends also by the bath level. With high bath levels the maximum voltage reached is lower because some fraction of the line current passes through the sides of the anodes, free from the adhering bubbles.

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Match the entities in Column I with the corresponding processes in Column II.a)P-4, Q-2, R-3, S-1b)P-2, Q-4, R-3, S-1c)P-3, Q-4, R-1, S-2d)P-4, Q-1, R-2, S-3Correct answer is option 'B'. Can you explain this answer?

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