Chemistry 12 Chapter 6 General Principles and Processes of Isolation of Elements Part 3

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Question 23:

The main reactions occurring in blast furnace during extraction of iron from Haematite are _______.





Answer: (i), (iv)

Note: In the following questions two or more options may be correct

Question 24:

In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?

(i) Heating with stream of carbon monoxide.

(ii) Heating with iodine.

(iii) Liquation.

(iv) Distillation.

Answer: (i), (ii)

Question 25:

Which of the following statements are correct?

(i) A depressant prevents certain type of particle to come to the froth.

(ii) Copper matte contains and.

(iii) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of during the extraction.

(iv) Zinc can be extracted by self-reduction.

Answer: (i), (iii)

Question 26:

In the extraction of chlorine from brine _____________

(i) for the overall reaction is negative.

(ii) for the overall reaction is positive.

(iii) for overall reaction has negative value.

(iv) for overall reaction has positive value.

Answer: (ii), (iii)