The noble gas element that forms the largest number of compounds is .......

$XeF_2$ reacts with $PF_5$ to give

Which noble gas is the most abundant in the atmosphere?

Which statements among the following are correct about Helium?
$(i)$ Liquid helium is used to sustain powerful superconducting magnets.
$(ii)$ Liquid helium is useful to carry low temperature experiments.
$(iii)$ It is a heavy gas.
$(iv)$ It is a flammable gas.

Which of the following statements is $NOT$ true for noble gases?

Xenon forms different types of compounds. One of the compounds is represented as $XeO_{n_1}F_{n_2}$. If the ratio of $n_1$ to $n_2$ is $1$ for this compound,then which of the following options is incorrect?