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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. AZ n 2 + ,   K C N   a n d   H C l
  2. BN i 2 + ,   H C l   a n d   K C N
  3. CC d 2 + ,   K C N   a n d   H C l
  4. DC o 2 + ,   H C l   a n d   K C N

Correct answer

B. N i 2 + ,   H C l   a n d   K C N

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