P Block Elements

1 )

Bauxite has the composition

Al2O3

Al2O3, H2O

Al2O3 • 2H2O

None of above

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Answer :

2 )

Aluminium (III) chloride forms a dimer because

Higher coordination number can be achieved by aluminium

Aluminium has high ionization energy

Aluminium belongs to III group

It cannot form a trimer

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Answer :

AlCl₃ forms a dimer as there is unsaturation in coordination. Also it enables Al atoms to complete their octets.

3 )

Boron form covalent Compound due to

Higher ionisation enthalpy

Lower ionisation enthalpy

Small size

Both (a) and (c)

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4 )

The stability of +1 oxidation state increases in the sequence

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5 )

Aluminium has a great affinity for oxygen & it’s oxidation is an exothermic process. This fact is used in

Preparing thin foils of aluminium

Making utensils

Preparing duralumin alloy

Thermite welding

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