The complex having highest electrical conductivity in aqueous solution under similar conditions is . . . . . . .

  • A
    $[Co(H_2O)_4Cl_2]Cl$
  • B
    $[Co(H_2O)_3Cl_3]$
  • C
    $[Co(H_2O)_5Cl]Cl_2$
  • D
    $[Co(H_2O)_6]Cl_3$

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The purple color of $KMnO_4$ is due to which of the following?

Arrange the following complexes in the increasing order of conductivity of their solution:
$[Co(NH_{3})_{3}Cl_{3}], [Co(NH_{3})_{4}Cl_{2}]Cl, [Co(NH_{3})_{6}]Cl_{3}, [Cr(NH_{3})_{5}Cl]Cl_{2}$

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Which of the following species exhibits both $LMCT$ and paramagnetism?

When $100 \ mL$ of $0.2 \ M$ solution of $CoCl_3 \cdot x NH_3$ is treated with excess of $AgNO_3$ solution,$3.6 \times 10^{22}$ ions are precipitated. The value of $x$ is $\left(N_A = 6 \times 10^{23} \ mol^{-1}\right)$

Which of the following complex ions is the most stable?

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