Metals and Non-metals

1

How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.

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2

Metal X is found in nature as its sulphide XS. It is used in the galvanisation of iron articles. Identify the metal X. How will you convert this sulphide ore into the metal? Explain with equations.

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3

State the reason for the following: Sodium or potassium metals are kept immersed under kerosene.

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4

State the reason for the following: Calcium does not occur in free state in nature.

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5

State the reason for the following: Hydrogen gas is not evolved when most metals react with nitric acid.

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6

State the reason for the following: An iron strip dipped in a blue copper sulphate solution turns the blue solution pale green.

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7

State the reason for the following: Aluminium oxide is called an amphoteric oxide.

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8

State two ways to prevent the rusting of iron.

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9

What is reactivity series? How does the reactivity series of metals help in predicting the relative activities of various metals?

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10

Suggest different chemical processes used for obtaining a metal from its oxides for metals in the middle of the reactivity series and metals towards the top of the reactivity series. Support your answer with one example each.

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11

List in tabular form any three chemical properties on the basis of which metals and non-metals are differentiated.

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12

Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.

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