Chlorophyll is a coordination compound of . . . . . . .

The complex $[Cu(H_2O)_4]^{2+}$ absorbs light in the yellow region. What color will it emit as its complementary color?

Identify $(A)$ to $(E)$ and also explain the reactions involved.
$CuCO_3 \to CuO$ $\xrightarrow{\text{Heat with } CuS} (A)$ $\xrightarrow{\text{conc. } HNO_3} (B)$ $\xrightarrow{NH_{3(aq)}} (C) \text{ (Blue solution)}$
$CuCO_3 \to (D)$ $\xrightarrow{Ca(OH)_2} (E) \text{ (Milky)}$ $\xrightarrow{CO_2} Ca(HCO_3)_2 \text{ (Clear solution)}$

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:

Which of the following compounds contains ionic,covalent,and coordinate covalent bonds?

Match List-$I$ with List-$II$.

List-$I$ (Compound)	List-$II$ (Colour)
$A$. $Fe_4[Fe(CN)_6]_3 \cdot xH_2O$	$I$. Violet
$B$. $[Fe(CN)_5NOS]^{4-}$	$II$. Blood Red
$C$. $[Fe(SCN)]^{2+}$	$III$. Prussian Blue
$D$. $(NH_4)_3PO_4 \cdot 12MoO_3$	$IV$. Yellow

Choose the correct answer from the options given below: