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Which metals found iin combined state in...

Which metals found iin combined state in nature ? Why ?

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BEYOND PUBLICATION-PRINCIPLES OF METALLURGY-EXERCISE
  1. …………chemical process involves heat.

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  2. furnace has both furnace and hearth separated.

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  3. If the impurity (gangue) is acidic substance, then the flux used is

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  4. Correct statement among the following :

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  5. Extract Na from NaCl, we obtain Na at

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  6. Which of the following slag is formed between CaO and SiO2?

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  7. Which of the following matching is wrong ?

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  8. Which of the following step is not involved in the extraction of Ag ?

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  9. Chemically rust is a

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  10. More the H+ ion concentration increases the rate of rusting due to

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  11. Which of the following is the correct order of activities series ?

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  12. Aluminium is more reactive than Iron, but rate of corrosion in Iron is...

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  13. In the froth floatation process ore particles are come along with the ...

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  14. Which of the following metal is not available in native state ?

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  15. Which method is most suitable to enrich the sulphide ores ?

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  16. Which of the following reagent is used in the extraction of Aluminium ...

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  17. Why do gold and silver found in free state in nature ?

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  18. Which metals found iin combined state in nature ? Why ?

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  19. What happens when crushed particles are washed ?

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  20. How do the metals like zinc, iron are extracted from their ores ?

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