Test: Aluminium and Its Compounds - JEE MCQ

It fumes in moist air.

It exists as dimer both in the vapor state below 350^oC and in non-polar solvents

It is prepared by heating Al₂O₃ in a stream of Sulphur chloride ( S₂Cl₂ ) vapor and chlorine.

All of these

Al shows amphoteric character

Gas 'P' and 'Q' are different

Both X and Y are water soluble

Gas Q is inflammable

1 and 2

1 and 3

2 and 4

3 and 4

A precipitate is formed which does not dissolve in excess of ammonium hydroxide

A precipitate is formed which dissolves in excess of ammonia solution

No precipitate is formed

None of these

On heating it melts and loses its water of crystallization.

It's aqueous solution is basic in nature.

It is used in dyeing industries.

It's empirical formula is KAl(SO₄)_2⋅12H₂O..

Al³⁺ and Cl^- ions

and Cl^- ions

and ions

none of the above

Heating

By passing dry HCl over hot aluminium powder

By passing dry Cl₂ over hot aluminium powder

By passing dry Cl₂ over a hot mixture of alumina and coke

CO and CO₂ are produced in this process

Al₂O₃ is mixed with CaF₂ which lowers the melting point of the mixture and brings conductivity

Al³⁺ is reduced at the cathode to form Al

Na₃AlF₆ helps in increasing the melting point of the mixture

NaOH can be stored in a vessel made of aluminium

HNO₃ can be stored in a vessel made of Be/Aluminium alloy

HF can be stored in a vessel coated of wax

HF attacks glass

B > Al > Ga > In > Tl

B > Al < Ga  >In > Tl

B > Al > Tl > In > Ga

B > Al < Ga < In < Tl

AlCl₃

Cl₄

Al₄C₃

both (a) and (b)

Good electrical conductivity

Good thermal conductivity

Low density

Non toxicity