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A non magnetic ore contaning the impurit...

A non magnetic ore contaning the impurity of `FeCr_(2)O_(4)` is concentrated by:

A

magnetic-separation

B

gravity separation

C

froth-floatation method

D

electrostatic method

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The correct Answer is:
A
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Potassium dichromate (K_(2)Cr_(2)O_(7)) is an orange coloured compound , very frequently used in laboratory as an oxidising agent as well as in a redox titration. It is generally prepared from chromite (FeCr_(2)O_(4)) ore according to the following reactions: (1) Fusion of chromite ore with sodium carbonate in excess of air. FeCr_(2)O_(4) + Na_(2)CO_(3) + O_(2) rarr Na_(2)CrO_(4)+Fe_(2)O_(3) +CO_(2) (2) Acidifing filtered sodium chromate solution with sulphuric acid. Na_(2)CrO_(4) + H_(2)SO_(4) rarr Na_(2)Cr_(2)O_(7) + Na_(2)SO_(4) + H_(2)O (3) Treating sodium dichormate with potassium choride . Na_(2)Cr_(2)O_(7) + KCl rarr K_(2)Cr_(2)O_(7) + NaCl If whole of the chormite ore given in the previous question gets consumed and sufficient amount of rest of the reactants are given, then the mass of K_(2)Cr_(2)O_(7) obtained is:

MOTION-METALLURGY-EXERCISE 2 (LEVEL - I)
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  2. Three most occurring elements into the earth crust are :

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  4. A piece of steel is heated until redness and then plunged into cold wa...

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  5. Give the correct of initials T or F following statemetns. Use T if sta...

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  6. In the extraction of aluminium Process X: employed for red bauxite t...

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  7. Which of the following statement(s) is/are incorrect?

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  8. Si and Ge used for semiconductors are required to be of high purity an...

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  9. In electrorefining of metals anode and cathode are taken as thick slab...

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  10. Select the correct statement :

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  11. The metal for which, its property of formation of volatile complex is ...

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  12. Match List-I with List-II List-I(Property) I Explosive II Self-...

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  13. A metal has a high concentration into the earth crust and whose oxides...

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  14. The process, which does not use a catalyst is

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  15. Refractory materials are generally used in furnaces because

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  16. % of silver in ‘german silver’ is :

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  17. Modern method of steel manufacturing is :

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  18. When an impurity in a metal has greater affinity for oxygen and is mor...

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  19. The chemical process in the production of steel from haematite ore inv...

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  20. "Fool's gold" is:

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