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Copper reacts with moist carbon dioxide ...

Copper reacts with moist carbon dioxide in the air and slowly loses its shine to gain a green coat of ____.

A

copper oxide

B

iron oxide

C

copper carbonateq

D

none of the above

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Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. What happens to silver ornaments if they are exposed to air containing H_(2)S gas?

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Metals get attacked by substances around it such as moisture, acids, etc. Metal is said to 'corrode' due to this attack and the process is called corrosion. Many metals like iron, copper, silver, etc. get corroded. When iron is exposed to moist air, it undergoes corrosion and a reddish brown coloured solid layer is formed on its surface. Corrosion of iron, which is known as rusting, is a serious problem as enormous amount of money is spent every year to replace damaged iron. Similarly, copper reacts with moisture and. CO_(2) in air to form a green coloured coating of basic copper carbonate on its surface. Silver acquires a black colour when exposed to air containing H_(2)S due to the formation of silver sulphide on its surface. Based on the above paragraph, answer the following question. Why do we apply paint on iron articles?

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CHETANA PUBLICATION-Metallurgy-EXAMPLE
  1. Copper reacts with moist carbon dioxide in the air and slowly loses it...

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  2. Select the odd man out Copper, Gallium, Gold, Silver.

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  3. Select the odd man out Silver, Gold, Platinum, Calcium

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  4. Select the odd man out K2O,Na2O,CaO,Al2O3

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  5. Select the odd man out Malleability, Ductility, Brittleness, Luster

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  6. Select the odd man out Graphite, Iodine, Silver, Phosphorous

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  7. Select the odd man out Sodium oxide, Zinc oxide, Potassium oxide, Ma...

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  8. Select the odd man out Steel, Iron, Copper, Tungsten

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  9. Select the odd man out Galvanizing, Tinning, Anodizing, Roasting

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  10. Select the odd man out Brass, Bronze, Steel, Antimony.

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  11. Find out the correlations: Metal:Reducing agent:: Non-metal:

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  12. Find out the correlations: Brass:Copper and zinc : : Brozne:

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  13. Find out the correlations: Aluminium : Bauxite : : Mercury:

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  14. Find out the correlations: Cryolite : Na3AlF6 : : Fluorspar :

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  15. Find out the correlations: Alumina : Al2O3:: Sodium aluminate:

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  16. Find out the correlations: Coating of tin over metal:Tinning:: Coat...

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  17. Match the columns:

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  18. Match the columns:

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  19. Match the columns:

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  20. Alloy of sodium with mercury.

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  21. Molecular formula of the common ore of aluminium

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