Which of the following complexes has the lowest molar conductivity in solution?

  • A
    $CoCl_3 \cdot 3NH_3$
  • B
    $CoCl_3 \cdot 4NH_3$
  • C
    $CoCl_3 \cdot 5NH_3$
  • D
    $CoCl_3 \cdot 6NH_3$

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On adding excess of ammonium hydroxide to a copper sulphate solution:

When $Co(II)$ chloride is dissolved in concentrated $HCl$,a blue solution is obtained. Upon dilution with water,the colour changes to pink because:

The correct increasing order of trans-effect of the following species is:

$Ag^{+} + NH_3 \rightleftharpoons [Ag(NH_3)]^{+}$; $k_1 = 3.5 \times 10^{-3}$
$[Ag(NH_3)]^{+} + NH_3 \rightleftharpoons [Ag(NH_3)_2]^{+}$; $k_2 = 1.7 \times 10^{-3}$
Then the formation constant of $[Ag(NH_3)_2]^{+}$ is

On treatment of $100 \ mL$ of $0.1 \ M$ solution of $CoCl_3 \cdot 6H_2O$ with excess $AgNO_3$,$1.2 \times 10^{22}$ ions are precipitated. The complex is:

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