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MHT CET202521 Apr 2025Morning ShiftChemistryd and f Block ElementsActual

If Ln represents lanthanoid element find the general formula of lanthanoid hydroxide.

Options

  1. ALn ( OH )
  2. BLn ( OH )₂
  3. CLn ( OH )₃
  4. DLn ( OH )₄

Correct answer

C. Ln ( OH )₃

Step-by-step solution

The most stable oxidation state for lanthanoids is +3, giving the Ln ³⁺ cation. Hydroxide ions carry a -1 charge ( OH ^- ), so three are required to balance the +3 charge: Ln ³⁺ + 3 OH ^- Ln ( OH )₃ . Among the options, only Ln ( OH )₃ corresponds to the +3 oxidation state. Final answer: C

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