What is produced by the hydrolysis of $(Me)_2SiCl_2$?

Concentrated hydrochloric acid,when exposed to air,sometimes produces a white cloud of smoke. What is the explanation for this?

Which species does not exist?

Give uses of carbon dioxide.

What would be the major product of the following reaction: $SiCl_4 \xrightarrow{\text{Excess of } H_2O}$?

Identify the correct statements:
$I)$ $CO$ reduces the oxygen carrying ability of blood.
$II)$ Producer gas contains $CO$ and $N_2$.
$III)$ $C-O$ bond length in $CO_2$ is $115 \ pm$.