$A$ radioactive element resembling iodine in properties is

Select the correct statement.

Which of the following halides cannot be hydrolysed at room temperature?
$I. TeF_6$ $II. SF_6$ $III. NCl_3$ $IV. NF_3$
Choose the correct code

Which among the following is a powerful bleaching and oxidising agent?

Which of the following is useful in the preparation of chlorine?

Identify the products obtained when chlorine reacts with hot and concentrated $NaOH$.