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More electropositive metals (more active...

More electropositive metals (more active metals ) are not prepared by electrolysis of Aqueous solutions of compounds of metals. This is because

A

Metal produced in less quanitity

B

`H_2O` undergoes reduction preferential to metal ion and liberates `H_2` gas

C

Aqueous solutions are stable to electrolysis

D

Metals are formed in liquid state

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BEYOND PUBLICATION-PRINCIPLES OF METALLURGY-EXERCISE
  1. Which of the following is wrong about poling ?

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  2. When an Iron object is painted, the process of corrosion is reduced du...

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  3. More electropositive metals (more active metals ) are not prepared by ...

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  4. Which of the following is true about preparation of Iron by smelting p...

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  5. Two test tubes. 'A' and 'B' contains iron nails. In 'A' test tube iron...

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  6. Buried underground pipes are coupled with small magnesium foils. This ...

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  7. During the electrolysis of sodium chloride ----------- gas liberates a...

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  8. is used to convert sulphide ore into oxide ore.

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  9. The ore of mercury is

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  10. Low boiling metals are purified by-----method

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  11. Rusting of iron is due to……..

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  12. The substance added to remove the impurity is

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  13. The formula for slag is………….

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  14. The furnaces in which there is no direct contact between the hearth an...

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  15. Which process are used for dressing of the ore ?

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  16. What is the importance of froth in this method ?

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  17. The oil used in froth flotation process is

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  18. What are the impurities present in the cast iron ?

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  19. Is there any other name for purification of impure metal ?

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  20. On which factors the purification of a metal depends ?

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