Explain physical characteristic of group $13$ elements.
Explain physical characteristic of group $13$ elements.
Boron is non-metallic in nature. It is extremely hard and black coloured solid.
It exists in many allotropic forms. Due to very strong crystalline lattice, boron has unusually high melting point.
Rest of the members are soft metals with low melting point and high electrical conductivity. It is worthwhile to note that gallium with unusually low melting point ( $303 \mathrm{~K}$ ), could exist in liquid state during summer.
Its high boiling point ($2676 K$) makes it a useful material for measuring high temperatures.
Density of the elements increases down the group from boron to thallium.
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Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.
Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.
- [IIT 2020]
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- [NEET 2013]