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Calcination

Give reason:C...

Question

Give reason:
Carbon is not used for making aluminium from aluminium oxides.

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Solution

Carbon is used for carbon reduction method in case of condensation of ore , but here aluminium is not preferably good position in the electrochemical series . because of this condensing of aluminium from aluminium oxide is not done by using carbon.

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Q. Give reasons :
(i) Conc.

H N O_{3}

can be transported in aluminium container.
(ii) A mixture of dilute NaOH and aluminium pieces is used to open drain.
(iii) Graphite is used as lubricant.
(iv) Diamond is used as an abrasive.
(v) Aluminium alloys are used to make aircraft body.
(vi) Aluminium utensils should not be kept in water overnight.
(vii) Aluminium wire is used to make transmission cables.

Q. Give the reasons for the following:
(i) Zinc is used in galvanisation and dry cells.
(ii) Nitric acid can be stored in aluminium containers.
(iii) Aluminium oxide cannot be reduced by carbon.
(iv) A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.
(v) Extraction of aluminium was very difficult in the beginning.
(vi) Carbon anodes are used in the electrolytic extraction of aluminium.
(vii) Galvanized metal ions should not be used for storing food.

Aluminium containers can be used for storing

H N O_{3}

Reason: Nitric acid cannot oxidize aluminium at all.

Pick the odd member from the list giving reasons :

(a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide.

(b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide.

Q. Assertion :Aluminium is use in thermite process. Reason: Aluminium has a high affinity for oxygen. It readily removes oxygen from oxides of less reactive metals so it is used in thermite welding.

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