NCERT MCQ CLASS-12 CHAPTER-6 | CHEMISTRY NCERT MCQ | GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS | EDUGROWN

In This Post we are  providing Chapter-6 General Principles and Processes of Isolation of Elements NCERT MCQ for Class 12 Chemistry which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.

NCERT MCQ ON GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

Question 1.
Concentration of sulphide ore is done by
(a) froth flotation process
(b) electrolysis
(c) roasting
(d) None of these

Answer: (a) froth flotation process

Question 2.
Malachite is an ore of
(a) iron
(b) copper
(c) zinc
(d) Sliver

Answer: (b) copper

Question 3.
Formula of copper pyrite is
(a)Cu₂S
(b) CuFeS
(c) CuFeS₂
(d) Cu₂Fe₂S₂

Answer: (c) CuFeS₂

Question 4.
Ore of aluminum is
(a) bauxite
(b) hematite
(c) dolomite
(d) None of these

Answer: (a) bauxite

Question 5.
Removal of the unwanted materials like sand, clays, etc. from the ore is known as ………., …….. or ……….
(a) concentration, dressing, benefaction
(b) separation, refining, gangue
(c) magnetic separation, purification, gangue
(d) washing, refining, amalgamation

Answer: (a) concentration, dressing, benefaction

Question 6.
For which of the following ores froth floatation method is used for concentration?
(a) Hematite
(b) Zinc blende
(c) Magnetite
(d) Camallite

Answer: (b) Zinc blende

Question 7.
The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as
(a) metallurgy
(b) leaching
(c) froth floatation process
(d) gravity separation

Answer: (d) gravity separation

Question 8.
The oil used as frothing agent in froth floatation process is
(a) coconut oil
(b) castor oil
(c) palmitic oil
(d) pine oil

Answer: (d) pine oil

Question 9.
Which of the following metals is not extracted by leaching?
(a) Aluminum
(b) Mercury
(c) Silver
(d) Gold

Answer: (b) Mercury

Question 10.
Sulphide ore of zinc/copper is concentrated by
(a) floatation process
(b) electromagnetic process
(c) gravity separation
(d) distillation

Answer: (a) floatation process

Question 11.
Which of the following ores is concentrated by chemical leaching method?
(a) Cinnabar
(b) Argentite
(c) Copper pyrites
(d) Galena

Answer: (b) Argentite

Question 12.
How do we separate two sulphide ores by froth floatation method?
(a) By using excess of pine oil
(b) By adjusting proportion of oil to water or using depressant.
(c) By using some solvent in which one of the sulphide is soluble
(d) By using collectors and froth stabilizers like xanthates

Answer: (b) By adjusting proportion of oil to water or using depressant.

Question 13.
Common impurities present in bauxite are
(a) CuO
(b) ZnO
(c) CaO
(d) SiO₂

Answer: (d) SiO₂

Question 14.
An ore of tin containing FeCrO₄ is concentrated by
(a) gravity separation
(b) magnetic separation
(c) froth floatation
(d) leaching

Answer: (b) magnetic separation

Question 15.
Which of the following ores cannot be concentrated by magnetic separation?
(a) Hematite
(b) Malachite
(c) Magnetite
(d) Siderite

Answer: (b) Malachite

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