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Which is true for an element R present in Ill A group of the periodic table

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It has +4 oxidation state

It is gas at room temperature

It forms RX₂

It forms R₂O₃

answer is C.

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Detailed Solution

General configuration of group 13 elements is ns² np³ indicating that each element has three valence electrons. These elements generally stable in +3 oxidation state but for higher elements +1 is more stable due to the inert pair effect.

option 1 is incorrect because no element in group 13 is in gaseous state.

option 2 is incorrect because stable oxidation states for group 13 are +3 and +1.

option 3 is correct because the oxidation state of R in R₂O₃ is +3 which is a stable oxidation state.

option 4 is wrong because the oxidation state of R in RX₂ is +2.

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