BSEB 12th Chemistry Most Important Objective MCQ Question Chapter Wise
6. GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS
1. Which one of the following is not an ore of zinc ?
(A) Zinc blende
(B) Calamine
(C) Zincite
(D) Bauxite
| Answer :- (D) |
2. Which of the following metals does not liberate hydrogen gas on reactions with acid ?
(A) Fe
(B) Zn
(C) Cu
(D) Mg
| Answer :- (C) |
3. Which of the following statement is true ?
(A) All ores are minerals
(B) All minerals are ore
(C) All alkalis are not bases
(D) All of these
| Answer :- (A) |
4. Mineral from which metal is extracted, is called :
(A) Ore
(B) Gangue
(C) Slag
(D) none of these
| Answer :- (A) |
5. Which of the following oxides is reduced in blast furnace ?
(A) Oxide of iron
(B) Oxide of copper
(C) Sodium oxide
(D) Zinc oxide
| Answer :- (A) |
6. When a metal oxide is heated with carbon, then metal is formed, MxOy + yC → XM + yCO, here carbon acts as :
(A) oxidising agent
(B) Reducing agent
(C) Stabilizer
(D) None of these
| Answer :- (A) |
7. The chief ore of copper is :
(A) Copper pyrite
(B) Copper Glance
(C) Galena
(D) Siderite
| Answer :- (B) |
8. Concentration of sulphide ore is done by :
(A) froth flotation process
(B) electrolysis
(C) roasting
(D) None of these
| Answer :- (A) |
9. Malachite is an ore of
(A) iron
(B) copper
(C) zinc
(D) silver
| Answer :- (B) |
10. Formula of copper Pyrite is :
(A) Cu2S
(B) CuFeS
(C) CuFeS2
(D) Cu2Fe2S2
| Answer :- (C) |
11. Ore of aluminium is :
(A) bauxite
(B) hematite
(C) dolomite
(D) None of these
| Answer :- (A) |
12. Chief ore of Iron is :
(A) Magnetite
(B) Siderite
(C) Hacinatite
(D) All
| Answer :- (D) |
13. A process of heating ore of a metal in excess of air below it melting point is called :
(A) Roasting
(B) Smelting
(C) Calcination
(D) ALL
| Answer :- (A) |
14. Copper metal is purified by which of the following method
(A) Electrolytic refining
(B) Zone refining
(C) Chromatography
(D) None
| Answer :- (A) |
15. 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) |
16. Which of the following metals is not extracted by leaching ?
(A) Aluminium
(B) Mercury
(C) Silver
(D) gold
| Answer :- (B) |
17. Sulphide ore of zinc/copper is concentrated by :
(A) floatation process
(B) electromagnetic process
(C) gravity separation
(D) distillation
| Answer :- (A) |
18. Common impurities present in bauxite are :
(A) Cuo
(B) Zno
(C) CaO
(D) SiO2
| Answer :- (D) |
19. Heating pyrites to remove sulphur is called :
(A) smelting
(B) calcination
(C) liquation
(D) roasting
| Answer :- (D) |
20. Electrolytic refining is used to purify which of the following metals ?
(A) Cu and Zn
(B) Ge and Si
(C) Zr and Ti
(D) Zn and Hg
| Answer :- (A) |
21. Dolamite mineral contains
(A) Mg
(B) AI
(C) Ca
(D) K
| Answer :- (A) |
22. Name important ore of aluminium
(A) Bauxite
(B) Cryolite
(C) Croundum
(D) None
| Answer :- (A) |
23. NaOH is known as ?
(A) Caustic soda
(B) Washing soda
(C) Caustic Potash
(D) All
| Answer :- (A) |
24. The formula of blue vitriol is :
(A) CuSO4
(B) CuSO4.5H2O
(C) CaSO4.2H2O
(D) None
| Answer :- (B) |
25. Which of the following method is used for the concentration of zinc blende ore ?
(A) Gravity separation process
(B) Magnetic separation process
(C) Froth floatation process
(D) None of these
| Answer :- (C) |
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