The element $X$ which forms a stable product of the type $XCl_4$ is $....$

$Si(OH)_4$ acid is produced at the end of hydrolysis of $SiCl_4$. Is this statement true or false?

$[SiO_4]^{4-}$ has a tetrahedral structure. Which silicate is formed by using three oxygen atoms?

Choose the $INCORRECT$ statement.

Which of the following statements is not correct?

In the following reaction,assign the correct category for the underlined atom in the product of complete hydrolysis at $R.T.$:
$H_3\underset{-}{P}O_5 + H_2O \longrightarrow H_3PO_4 + H_2O_2$