Which of the following statements is / are correct? 

When lead nitrate is heated to at  ${400}^{o}C$  only brown gas is released. 

Complete Hydrolysis of  ${\text{PCl}}_5$ gives  ${\text{H}}_{\text{3}}{\text{PO}}_{\text{4}}$ and HCl 

${\text{N}}_{\text{2}}{\text{O}}_{\text{5}}\left(\text{g}\right){\text{+2NaOH}}_{\left(\text{aq.}\right)}\to {\text{2NaNO}}_{\text{3}}{\text{+H}}_{\text{2}}\text{O}$

${\text{CCl}}_{\text{4}}$  can not be hydrolysed but hydrolysis of  ${\text{SiCl}}_{\text{4}}$ can form  ${\text{H}}_{\text{4}}{\text{SiO}}_{\text{4}}\text{+HCl}$