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Select CORRECT about the chemical properties of lanthanoids (Ln).

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React with water at room temperature to produce $L n {(O H)}_{3} + H_{2}$

They produce $H_{2}$ gas with dil. Acid

At elevated temperature Ln reacts with nitrogen to produce $L n_{3} N_{2}$ type salt

They produce $L n_{2} O_{3}$ type oxides when burn in $O_{2}$ .

answer is A, B, D.

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$L n + N_{2} \to L n N$

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