MCQ
Match List-I with List-II
List-I
Complex
List-II
Primary valency and Secondary valency
(A)$\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}$(I)3 $\quad$ 6
(B)$\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]$(II)3 $\quad$ 4
(C)$\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_{4}\right]$(III)2 $\quad$ 6
(D)$[\mathrm{Mg}(\mathrm{EDTA})]^{2-}$(IV)2 $\quad$ 4
Choose the correct answer from the options given below :
  • A
    (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  • B
    (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
  • C
    (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  • D
    (A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Answer

B. (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
Primary valency $=$ Oxidation state Secondary valency $=$ Co-ordination number
ComplexPrimary valencySecondary valency
(A)$\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}$36
(B)$\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]$24
(C)$\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_{4}\right]$34
(D)$[\mathrm{Mg}(\mathrm{EDTA})]^{2-}$26

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