In the manufacture of sulphuric acid by the contact process,the Tyndall box is used to

Choose the correct statements from the following:
$A$. All group $16$ elements form oxides of general formula $EO_2$ and $EO_3$ where $E=S, Se, Te$ and $Po$. Both the types of oxides are acidic in nature.
$B$. $TeO_2$ is an oxidising agent while $SO_2$ is reducing in nature.
$C$. The reducing property decreases from $H_2S$ to $H_2Te$ down the group.
$D$. The ozone molecule contains six lone pairs of electrons.
Choose the correct answer from the options given below:

Oxygen does not react directly with which of the following?

Ozone with $KI$ solution produces:

Which of the following is not a chalcogen?

Photoconductors in xerox machines use which of the following?