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An element R is in group 13. Which is true with respect of R ?

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It is a gas at room temperature

It forms an oxide of the type $R_{2} O_{3}$

It forms a halide of the type of $R X_{2}$

It has an oxidation state of +4

answer is A.

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Detailed Solution

Group III A or group 13 members have ${ns}^{2} {np}^{1}$ configuration.

The common oxidation states=+1,+3

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