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The p-Block Elements

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Question

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Name the allotropic forms of boron.

Solution

Crystalline boron and amorphous boron.

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Question

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Name the element of group 13 which forms only covalent compounds.

Solution

Boron forms only covalent compounds. For example, BF₃, BCl₃.

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Which element of group 13 forms amphoteric hydroxide?

Solution

Both Aluminium and Gallium forms amphoteric hydroxides.

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Which element of group 13 forms the most stable +1 oxidation state?

Solution

Thallium(Tl). This is due to inert pair effect because of which it forms the most stable +1 oxidation state.

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