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Question
Which is true for an element present in group 13 of the periodic table ?
Options:
A .  It is gas at room temperature
B .  It has oxidation state of +4
C .  It forms R2O3
D .  It forms RX2
Answer: Option C
:
C
13th group elements have 3 valency electrons hence they can show oxidation state +3 and +1

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