Identify the incorrect pair.

  • A
    $Co^{2+} - \text{Vitamin } B_{12}$
  • B
    $Se^{2+} - \text{Krebs cycle}$
  • C
    $Mg^{2+} - \text{Photosynthesis}$
  • D
    $Fe^{2+} - \text{Hemoglobin}$

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Hypo is used in photography because of its:

Identify the use of $EDTA$ from the following.

Match List-$I$ with List-$II$:
$A$. Haber process $I$. Fe catalyst
$B$. Wacker oxidation $II$. $PdCl_2$
$C$. Wilkinson catalyst $III$. $[(PPh_3)_3RhCl]$
$D$. Ziegler catalyst $IV$. $TiCl_4$ with $Al(CH_3)_3$

Choose the correct answer from the options given below:

For silver plating of copper,$K[Ag(CN)_2]$ is used instead of $AgNO_3$. This is because ........

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Prussian blue is formed when

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