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MCQ Questions for Class 12 Chemistry With Answers
Q1. Which of the following metals is leached by Cyanide process?
(i) Ag
(ii) Na
(iii) Al
(iv) Cu
(i) Ag
Q2. Pyrolusite is an ore of
(i) Ag
(ii) Hg
(iii) Sn
(iv) Mn
(iv) Mn
Q3. Malachite is an ore of
(i) iron
(ii) copper
(iii) zinc
(iv) Sliver
(ii) copper
Q4. Which ore can be best concentrated by froth floatation process?
(i) Malachite
(ii) Cassiterite
(iii) Galena
(iv) Magnetite
(iii) Galena
Q5. Flux is used to remove :
(i) basic impurities
(ii) acidic impurities
(iii) all types of impurities
(iv) acidic and basic both impurities
(iv) acidic and basic both impurities
Q6. Pyrolusite is a/an
(i) Oxide ore
(ii) Sulphide ore
(iii) Carbide ore
(iv) not an ore.
(i) Oxide ore
Q7. The process employed for the concentration of sulphide ore is
(i) Froth floatation
(ii) Roasting
(iii) Electrolysis
(iv) Calcination
(i) Froth floatation
Q8. Ore of aluminium is
(i) bauxite
(ii) hematite
(iii) dolomite
(iv) None of these
(i) bauxite
Q9. Bessemer converter is used in the manufacture of
(i) Pig iron
(ii) Steel
(iii) Wrought iron
(iv) Cast iron
(ii) Steel
Q10. Which of the following is a carbonate ore?
(i) Pyrolusite
(ii) Malachite
(iii) Diaspore
(iv) Cassiterite
(ii) Malachite
Q11. In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with
(i) FeS
(ii) CO
(iii) Cu2S
(iv) SO2.
(iii)
Q12. The metal always found in free state is
(i) Gold
(ii) Silver
(iii) Copper
(iv) Sodium
(i) Gold
Q13. For which of the following ores froth floatation method is used for concentration?
(i) Haematite
(ii) Zinc blende
(iii) Magnetite
(iv) Camallite
(ii) Zinc blende
Q14. Purest form of iron is
(i) Cast iron
(ii) Hard Steel
(iii) Stainless steel
(iv) Wrought iron
(iv) Wrought iron
Q15. In metallurgical process of aluminium, cryolite is mixed with alumina in its molten state, because it
(i) decreases the amount of alumina
(ii) oxidises the alumina
(iii) increases the melting point of alumina
(iv) decreases the melting point of alumina
(iv) decreases the melting point of alumina
Q16. In the metallurgy of which of the follo wing, cupellation process is used?
(i) Copper
(ii) Silver
(iii) Iron
(iv) Aluminium
(ii) Silver
Q17. Most abundant element in earth’s crust is
(i) O
(ii) Si
(iii) Al
(iv) Fe
(i) 0
Q18. The oil used as frothing agent in froth floatation process is
(i) coconut oil
(ii) castor oil
(iii) palmitic oil
(iv) pine oil
(iv) pine oil
Q19. Which of the following benefication process is used for the mineral Al2O3.2H2O?
(i) Froth Floatation
(ii) Leaching
(iii) Liquation
(iv) Magnetic separation
(ii) Leaching
Q20. Common impurities present in bauxite ore:
(i) CuO
(ii) ZnO
(iii) Fe2O3
(iv) None of these
(iii)
Q21. Sulphide ore of zinc/copper is concentrated by
(i) floatation process
(ii) electromagnetic process
(iii) gravity separation
(iv) distillation
(i) floatation process
Q22. The Mond’s process of refining is used for which of the following metals?
(i) Gold
(ii) Copper
(iii) Iron
(iv) Nickel
(iv) Nickel
Q23. In the metallurgy of iron from haematite, limestone is added to act as
(i) flux
(ii) slag
(iii) a reducing agent
(iv) an oxidising agent
(i) flux
Q24. How do we separate two sulphide ores by froth floatation method?
(i) By using excess of pine oil
(ii) By adjusting proportion of oil to water or using depressant.
(iii) By using some solvent in which one of the sulphides is soluble
(iv) By using collectors and froth stabilisers like xanthates
(ii) By adjusting proportion of oil to water or using depressant.
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MCQ Questions for Class 12 Chemistry with Answers
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