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प्रश्न
Calcium carbonate used in the extraction of iron acts as _______.
(A) oxidising agent
(B) reducing agent
(C) gangue
(D) flux
उत्तर
(D) flux
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Explain magnetic separation process of ores with the help of a neat, labelled diagram.
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In Van Arkel method of refining metal, impure zirconium is converted to unstable volatile
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(A) oxygen
(B) chlorine
(C) bromine
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In Van Arkel method for refining zirconium or titanium, the halogen used is __________.
Match the items of Column I with items of Column II and assign the correct code:
| Column I | Column II |
| (A) Pendulum | (1) Chrome steel |
| (B) Malachite | (2) Nickel steel |
| (C) Calamine | (3) \[\ce{Na3AlF6}\] |
| (D) Cryolite | (4) \[\ce{CuCO3.Cu (OH)2}\] |
| (5) \[\ce{ZnCO3}\] |
