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Give reasons: a. Platinum, gold, and s...

Give reasons:
a. Platinum, gold, and silver are used to make jewellery.
b. Sodium, potassium, and lithium ar stored under oil.
c. Aluminilum is a higly reactive metal, yet it is used to make utensils for cooking.
d. Carbonate and sulphate ores are usually converted into oxides during metal extraction.

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Though aluminium is a highly reactive metal it is resistant to corrosion. This is because alumnium reacts with oxygen present in air to form to thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen. Also it is light in weight and a good conductor of heat. Hence it is used to make cookking utensils.
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Give reason a. Platinum, gold and silver are used to make jewellery. b. Metals like sodium and potassium are stored under oil.

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State one property of each of the following which makes them suitable for the followng: a. Copper and aluminium for making electric wires b. Gold, platinium and silver are used to make jewellery c. Copper to make hiot water tank d. Graphite in making electrodes e. Alloys for making bells and strings in musical instruments.

During the reaction of some metals with dilute hydrochloric acid, following observations were made. (a) Silver metal does not show any change (b) The temperature of the reaction mixture raises when aluminium is added. (c) The reaction of sodium metal is found to be highly explosive. (d) Some bubbles of a gas are seen when lead reacts with the acid. Explain these observations giving suitable reasons.

Carbon cannot be used to reduce the oxide of sodium, magnetsium, calcium, etc.to their respective metals. State the method used for obtaining these metals from their salts. For obtaining sodium from its compound. a. Name the salt used, gas produced, and the electrode at which the metal deposits. b. Show the chemical reaction taking place during the process. c. Name any two other metals which can be obtained from its compounds by the above method.

A metal X is used extensively in making aeroplane bodies as it is light in weight it is also used in extraction of metals by displacement reaction. The metal obtained during one such displacement is a molten metal as the reaction involved is hightly exothermic. The reaction mentioned above is used in joining railway tracks. a. Identify the metal X. b. What is the reaction mentioned above called? c.Write the chemical reaction for the above reaction.

CPC CAMBRIDGE PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. Which of the following pasirs give displacement reactions? (i) NaCl ...

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  2. Which of the following method is suitable preventing an iron fr...

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  3. An element reacts with oxygen to give a compound with high melting poi...

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  4. Food cans are coated with tin and not with zinc because

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  5. Your are given harmmer, a battery , a bulb, wires, and a switch. a. ...

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  6. Your are given harmmer, a battery , a bulb, wires, and a switch. a. ...

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  7. What are amphoteric oxides ? Give examples.

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  8. Name two metals which will displace hydrogen from dilute acids, and tw...

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  9. In the electrolyte refining of a meal M, what would take the anode, th...

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  10. Pratyush took sulphur powders on a spatula and heated it. He collected...

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  11. State two ways to prevent the rusting of iron.

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  12. What type of oxides are formed when non-metals combine with oxygen ?

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  13. Give reasons: a. Platinum, gold, and silver are used to make jewelle...

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  14. Give reason: Sodium, potassium and lithium are stored under oil.

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  15. Give reasons: a. Platinum, gold, and silver are used to make jewelle...

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  16. Give reason : Carbonate and Sulphide ores are usually converted into o...

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  17. You must have been seen tarnished copper vessels being cleaned with le...

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  18. Differentiate between metal and non-metal on the basis of chemical pro...

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  19. A man went door to door posing 2s a goldsmith he promised to bring bac...

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  20. Give reasons why is copper used to make hot water tanks and not steel ...

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