Turnbull's blue is a compound

The complex formed by carbon monoxide with hemoglobin is called .....

Sodium thiosulphate,$Na_2S_2O_3 \cdot 5H_2O$ is used in photography to

Assign $A, B, C, D$ from the given type of reaction.
$2K_3[Fe(CN)_6] + 3FeCl_2 \longrightarrow Fe_3[Fe(CN)_6]_2 \downarrow + 6KCl$

Aqueous solution of a metallic nitrate $X$ reacts with $NH_4OH$ to form $Y$,which dissolves in excess $NH_4OH$. The resulting complex is reduced by acetaldehyde to deposit the metal. $X$ and $Y$,respectively,are

Chlorophyll contains