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Why should the metal sulphides and carbo...

 Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them? 

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It is easier to obtain metal from its oxide, as compared from its sulphides and carbonates. So prior to reduction, sulphides ores are converted into oxides by roasting and carbonate ores by calcination.
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A sulphide ore is converted into metal oxide by the process of:

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How is mercury extracted from its sulphide ore? Write the balanced chemical equations involved in the process. Why are carbonate or sulphide ores converted to oxides during the process of extraction? Is magnesium oxide an ionic compound or a covalent compound? Give reasons to support your answer.

VK GLOBAL PUBLICATION-METALS AND NON-METALS-SHORT ANSWER QUESTION-I
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  5. Give reasons for the following : Metals replace hydrogen from dilute...

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  6. What happens when iron nail is placed in silver nitrate solution? ...

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  7. Why do metals not evolve hydrogen gas with nitric acid?

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  12. An ore gives carbon dioxide on treatment with a dilute acid. What step...

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  13. The following reaction takes place when aluminium powder is heated wit...

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  14. What is a thermite reaction? Explain with the help of an equation.stat...

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  15. Why should the metal sulphides and carbonates be converted to metal ox...

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  16. What is 24-carat gold? How will you convert it into 18-carat gold?

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  18. Explain why, the galvanised iron article is protected against rusting ...

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  19. Why is aluminium oxide considered an amphoteric oxide?

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