Which of the following substances can be used for drying gases?

Which of the following chemicals contains chlorine?

Among the following,the correctly matched pair is

Out of the two allotropic forms of dihydrogen,the form with lesser molecular energy is

Anhydrous calcium chloride $(CaCl_2)$ is which type of compound?

Which of the following statements is not true for hydrogen:
$1)$ It exists as a diatomic molecule.
$2)$ It has one electron in the outermost shell.
$3)$ It can lose an electron to form a cation which can freely exist.
$4)$ It cannot form ionic compounds.