Which of the following can chlorine not displace?

Which of the following molecules give oxyacid as well as hydra acid on hydrolysis at room temperature?

Sodium chloride when heated with conc. $H_2SO_4$ and solid potassium dichromate gives

The correct statement$(s)$ about the oxoacids,$HClO_4$ and $HClO$,is(are):
$[A]$ $HClO_4$ is more acidic than $HClO$ because of the resonance stabilization of its anion.
$[B]$ $HClO_4$ is formed in the reaction between $Cl_2$ and $H_2O$.
$[C]$ The central atom in both $HClO_4$ and $HClO$ is $sp^3$ hybridized.
$[D]$ The conjugate base of $HClO_4$ is a weaker base than $H_2O$.

Which one of the following reacts with glass?

In the following reaction,identify the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$\underline{Cl}F_5 + H_2O \longrightarrow HClO_3 + HF$