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JEEMAIN and NEET
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Chemistry
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p-Block elements (Group-15 to Group-18)
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Which of the following is the only noble gas not to occur in the free state in the atomosphere, air, in oute space or in natural gases etc.
$\begin{array}{1 1} Radon \\ Argon\\ Xenon \\ Krypton \end{array}$
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