In hemoglobin, the metal ion present is:

To inhibit the growth of tumours,identify the compounds used from the following:
$(A)$ $EDTA$
$(B)$ Coordination Compounds of $Pt$
$(C)$ $D$-Penicillamine
$(D)$ $Cis-Platin$
Choose the correct answer from the option given below:

When conc. $H_2SO_4$ is treated with $K_4[Fe(CN)_6]$,$CO$ gas is evolved. If dilute $H_2SO_4$ is used instead of conc. $H_2SO_4$,the gas evolved is:

When acetic acid and $K_4[Fe(CN)_6]$ are added to a copper salt solution,which substance forms a chocolate-brown precipitate?

Chlorophyll contains

State the importance of coordination compounds in:
$1$. Industrial processes
$2$. Biological systems