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NEET2005Chemistryd and f Block ElementsActual

The aqueous solution containing which one of the following ions will be colourless? (Atomic number : Sc =21, Fe =26, Ti =22, Mn =25 )

Options

  1. ASc ³⁺
  2. BFe ²⁺
  3. CTi ³⁺
  4. DMn ²⁺

Correct answer

A. Sc ³⁺

Step-by-step solution

( array |c|c|c| Ion & array c No. of Electrons array & array c Electronic Configuration array & Electronic Configuration in box & array c No. of Unpaired array & array c Magnetic Nature array & array c Magnetic Mo- ment (BM) = n( n +2) array Sc ³⁺ & 18 & [ Ar ] 3 d^0 4 ~s ^0 & [ Ar ] ~ array |l|l|l|l|l| ~~ & ~~ & ~~ & ~~ & ~~ array ~~ array |l| ~~ array & 0 & Diamagnetic & 0 Ti ³⁺ & 22 & [ Ar ] 3 d^4 4 ~s ^0 & [ Ar ] ~ array |l|l|l|l|l| & ~~ & ~~ & ~~ & ~~ array ~~ array |l| ~~ array & 1 & Paramagnetic & 1.73 Mn ²⁺

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