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Although carbon and hydrogen are good re...

Although carbon and hydrogen are good reducing agents, they are not used in the reduction of metal oxides at high temperatures - why ?

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Because at higher temperature both C and H react with metals to form corresponding carbides and hydrides.
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-SOLVED NCERT EXEMPLAR PROBLEMS (Short Answer Type)
  1. An external emf of 2.2 V is required for the manufacture of Cl(2) from...

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  2. Coke can be used to reduce FeO to Fe at temperatures above 1073K. Just...

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  3. Wrought iron is the purest form of iron. Write the reactions involved ...

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  4. How can copper be extracted from low grade copper ores?

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  5. Mention two primary requirements for the purification of metals by Mon...

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  6. Although carbon and hydrogen are good reducing agents, they are not us...

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  7. Name two sulphide ores which can be separated by froth-floatation.

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  8. The purest form of iron is prepared by oxidising the impurities presen...

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  9. A mixture of two compounds 'A' and 'B' is allowed to pass through a co...

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  10. Copper sulphide ore is heated in a furnace with silica-why?

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  11. Explain why a sulphide ore is converted into an oxide before reduction...

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  12. What is the method used in the purification of Zr and Ti? Explain with...

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  13. What are the points to be kept in mind during the extraction of metals...

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  14. What is the role of flux in extraction of metals?

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  15. How are the metals used as semiconductors purified? Explain the princi...

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  16. Write the reaction taking place during the extraction of iron in the b...

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  17. Mention two important requirements of vapour phase refining.

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  18. Write the equations involved in the extraction of gold by cyanide proc...

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