Which product is formed when an excess of $KCN$ is added to a solution of copper sulfate?

  • A
    $Cu(CN)_2$
  • B
    $CuCN$
  • C
    $K_2[Cu(CN)_4]$
  • D
    $K_3[Cu(CN)_4]$

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Which of the following is non-conducting?

$A$ first row transition metal $(M)$ does not liberate $H_{2}$ gas from dilute $HCl$. $1 \ mol$ of aqueous solution of $MSO_{4}$ is treated with excess of aqueous $KCN$ and then $H_{2}S_{(g)}$ is passed through the solution. The amount of $MS$ (metal sulphide) formed from the above reaction is . . . . . . $mol$.

Which of the following factors tends to increase the stability of metal ion complexes?

Among $[Fe(H_2O)_6]^{3+}$,$[Fe(CN)_6]^{3-}$,$[Fe(C_2O_4)_3]^{3-}$,and $[FeCl_6]^{3-}$,which complex is the most stable?

Which of the following ligands does not show synergic bonding with a central metal atom?

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