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Paragraph: An aqueous solution of metal ion M 1 reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M2 always forms tetrahedral complexes with these reagents. Aqueous solution of M 2 on reaction with reagent S gives white precipitate which dissolves in excess of S . The reactions are summarized in the scheme given be

Options

  1. AK 4 F e C N 6
  2. BN a 2 H P O 4
  3. CK 2 C r O 4
  4. DKOH

Correct answer

D. KOH

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