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Atomic Valency

The oxide of ...

Question

The oxide of aluminium has a chemical formula $A l_{2} O_{3}$ . State the valency of $A l$

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Solution

valency of Al is +3

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Q. The formula of Aluminium oxide is

A l_{2} O_{3}

. Find the valencies of Aluminium and Oxygen.

Q. Assertion :Al obtained only by electrolytic reduction of Alumina (pure) Reason: Aluminium metal has a strong affinity for oxygen and the oxide of Al is

A l_{2} O_{3}

, which is a very stable oxide. Hence ordinary chemically reducing agents are not sufficient to reduce

A l_{2} O_{3}

Q. Calculate the formula masses of the following compounds :
(i) Sodium oxide, Na₂O
(ii) Aluminium oxide, Al₂O₃
(Given : Atomic masses : Na = 23 u ; O = 16 u ; Al = 27 u)

Q. Calculate the number of aluminium ions present in 0.051 g of aluminium oxide (Al₂O₃). (Atomic masses: Al = 27 u; O = 16 u)

Q. Calculate the percentage of pure aluminium in 10 kg of aluminium oxide

[A l_{2} O_{3}]

of 90 % purity.
[Al=27, O=16]

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