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Nature of Oxides

How does the ...

Question

How does the surface of metals like aluminium zinc sodium iron lead copper magnesium apper after burning

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Solution

The surface of metals like aluminium, zinc, sodium, iron, lead copper lost their shining nature and they are coated with oxide film. For ex.,
2 Cu + O₂ -----> 2 CuO
2 Al + 3 O₂ -----> Al₂O₃

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Similar questions

The figure represents the reactivity of metals then which of the following are correct?

(i) Sodium is more reactive than magnesium.

(ii) Magnesium ad aluminium metals displace lead.

(iii) Magnesium and aluminium metals displace calcium.

(iv) Iron and tin metals can displace magnesium.

(v) Most reactive metal is sodium.

(vi) Gold is least reactive.

(vii) Calcium and zinc metals displace iron.

Q. Which sequence indicates correctly the increasing reactivity of metals?
(a) iron, zinc, magnesium, sodium, potassium
(b) sodium, potassium, magnesium, zinc, iron
(c) magnesium, potassium, sodium, iron, zinc
(d) iron, zinc, sodium, magnesium, potassium

Q. Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) stainless steel
(b) brass.

Q. At ordinary temperature the surface of metals, such as magnesium, aluminium, zinc, lead etc. do not undergo oxidation. Give reason.

Q. Write the formula of the following compounds.
calcium hydroxide, copper chloride, iron sulphate, sodium carbonate, copper nitrate, copper oxide, lead sulphide, magnesium chloride, zinc sulphate, potassium hydroxide.

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