The element X [1s², 2s²2p⁶, 3s²3p⁵] reacts with Y (atomic no. = 1) to form
(a) XY₂
(b) X₂Y
(c) XY
(d) None
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answer is C option ....
the given element is chlorine and it reacts with hydrogen that is atomic number 1 to form HCl that is of the form XY
hope that helps you....
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