P%20Block%20Elements - Topic Wise Multiple Choice Questions (MCQ)
Topic%20Wise%20free%20P%20Block%20Elements%20MCQ%20for%2011th%2012th%20exam%20Practice%20Multiple%20Choice%20Questions%20and%20answer%20for%20JEE-mains%20State%20CET%20Engineering%20Entrance%20GATE%20%20free%20Online%20Test
1 )
Bauxite has the composition
Al2O3
Al2O3, H2O
Al2O3 • 2H2O ✔
None of above
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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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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
Al
Tl
In
Ga
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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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