Which of the following elements is $NOT$ radioactive?

  • A
    $At$
  • B
    $Po$
  • C
    $Rn$
  • D
    $Ar$

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Which one of the following noble gases is not found in the atmosphere?

Why are the elements of Group $18$ known as noble gases?

Select the $INCORRECT$ statement regarding the following reactions:
$XeF_6 + \text{excess } H_2O \rightarrow 'X' + HF$
$XeF_6 + 2 \text{ moles } H_2O \rightarrow 'Y' + HF$

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Which of the following is not obtained by the direct reaction of constituent elements?

Total number of lone pair of electrons in $XeOF_4$ is

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