Identify the correct statements.

I. CO reduces the oxygen carrying ability of blood

II. Producer gas contains CO and $\mathrm{N}_2$

III. $\mathrm{C}-\mathrm{O}$ bond length in $\mathrm{CO}_2$ is 115 pm

Observe the following

$\mathrm{P}_4+\mathrm{SOCl}_2 \rightarrow$ Products

$\mathrm{P}_4+\mathrm{SO}_2 \mathrm{Cl}_2 \rightarrow$ Products

In both the reactions, a common product ' $x$ ' is obtained. The number of lone pair of electrons on the central atom of $x$ is

Identify the incorrect statement about silica.

The number of $\mathrm{P}=\mathrm{O}, \mathrm{P}-\mathrm{P}$ bonds present in oxoacid of phosphorus, prepared by treating red $\mathrm{P}_4$ with alkali are respectively