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Silica is added to roasted copper ore du...

Silica is added to roasted copper ore during smelting in order to remove :

A

cuprous oxide

B

cuprous sulphide

C

ferrous sulphide

D

ferrous oxide.

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The correct Answer is:
A
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level -I) Transition metal compounds and their Characteristics
  1. Ammonium dichromate is used in fireworks. The green coloured blown in ...

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  2. The number of moles of KMnO4 that will be needed to react with one mol...

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  3. Silica is added to roasted copper ore during smelting in order to remo...

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  4. Iron is rendered passive when treated with conc. :

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  5. The principal oxidation state of lanthanides is :

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  6. The lanthanoid contraction refers to :

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  7. Which of the following is not correct ?

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  8. Which of the following ions is paramagnetic ?

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  9. The separation of landthanoids in ion exchange method is based on :

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  10. which of the following has the smallest ionic radius ?

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  11. Zr and Hf have almost identical atomic radii. Give reason.

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  12. The colour of lanthoanoids and actinoids is due to :

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  13. Which of the following has tendency to act as an oxidising agent ?

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  14. Which of the following pairs has almost same colours ?

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  15. Which of the following good oxidising agent ?

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  16. The major component of alloys of lanthanides is

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  17. The lanthanide contraction is responsible for the fact that

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  18. The electronic configuration of terbium (IV) (At no. 65) is

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  19. Which of the following ions will exhibit colour in aqueous solutions ?

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  20. The lanthanoid elements than has the electronic configuration. [Xe] 4f...

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