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Carbon monoxide is more effective reduci...

Carbon monoxide is more effective reducing agent than carbon below 983 K but above this temperature the reverse is true. How would you explain this?

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Carbon monoxide is more effective reducing agent than carbon below 984 K but above this temperature the reverse is ture. How would you explain this?

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Explain the following (a) CO_(2) is a better reducing agent below 710 K whereas CO is a better reducing agent above 710 K . (b) Generally sulphide ores are converted into oxides before reduction. ( c) Silica is added to the sulphide ore of copper in the reverberatory furnance. (d) Carbon and hydrogen are not used as reducing agents at high temperature. (e) Vapour phase refining method is used for the purification of Ti

Give reason for the following : a. The first ioisation eathalpy of carbon carbon is greater than that foboron, whereas the reverse is true fore the second ionisation enthalpy . b. Solid carbon dioxie is known as dry ice . c. Why does not silicon form an analogue fo graphite ?

Alkali &alkaline earth metals have low ionisation enthalpies and hence exhibit characteristic flame colouration. They have high negative electrode potentials & hence are strong reducing agents. It dissolve in liquid ammonia to give a solution which conducts electricity and act as strong reducing agent. being stronger reducing agent than hydrogen, they are usually prepared by the electrolysis of their fused chlorides. Their oxides are basic and the basic strength increases down the group. The solubility of carbonates and sulphates of alkali and alkaline earth metals show opposite trends. only the carbonates of Li and alkaline earth metals decompose on heating. The bicarbonates of both alkali & alkaline earth metals on heating give carbonates. Which of the following process is used in the extractive metallurgy of sodium?

ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (SHORT ANSWER QUESTIONS)
  1. Describe briefly Van Arkel method for refining of metals.

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  2. What is the principle of zone refining of metals?

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  3. Carbon monoxide is more effective reducing agent than carbon below 983...

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  4. Which metals are generally extracted by the electrolytic process ? Wha...

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  5. What are the reactions taking place at the two electrodes during elect...

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  6. How is pure alumina prepared from bauxite in Baeyer's process? Give th...

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  7. Write down the chemical formulae of the following ores: Chalcopyrites,...

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  8. Name the principal ore of aluminium.

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  9. Describe the leaching of aluminium ore.

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  10. Explain the basic principles of the following metallurgical operations...

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  11. State briefly the principles which serve as the basis for the followin...

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  12. Write the chemical reactions which take place in the following operati...

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  13. Write the chemical reactions which take place in the following operati...

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  14. Write the chemical reactions which take place in the following operati...

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  15. What chemical principle is involved in choosing a reducing agent for g...

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  16. Describe the role of the following: NaCN in the extraction of silve...

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  17. Describe the role of the following: Cryolite in the extraction of a...

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  18. Give reason : Reduction of Cr(2) O(3) with Al is thermodynamically fea...

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  19. Account for the following facts: (a) The reduction of a metal oxide ...

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  20. Account for the following facts : pine oil is used in froth floatat...

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