Identify the elements $X$ and $Y$ using the ionisation energy values given below. $\begin{array}{*{20}{c}} {}&{\,\,\,\,\,\,\,\,{\rm{Ionisation}}{\mkern 1mu} {\mkern 1mu} {\rm{energy}}{\mkern 1mu} ({\rm{Ist}})}&{\,\,\,\,\,\,\,\,KJ/mol{\mkern 1mu} {\mkern 1mu} ({\rm{IInd}})}\\ X&{{\rm{495}}}&{{\rm{4563}}}\\ Y&{{\rm{731}}}&{{\rm{1450}}} \end{array}$

NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

1 Easy

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Analyzing +4 | -1

Identify the elements

X

and

Y

using the ionisation energy values given below.

\begin{array}{cccccccccccccccccccc} {}&{\,\,\,\,\,\,\,\,\mathrm{Ionisation}{\mkern 1mu} {\mkern 1mu} \mathrm{energy}{\mkern 1mu} (\mathrm{Ist})}&{\,\,\,\,\,\,\,\,KJ/mol{\mkern 1mu} {\mkern 1mu} (\mathrm{IInd})}\\ X&{\mathrm{495}}&{\mathrm{4563}}\\ Y&{\mathrm{731}}&{\mathrm{1450}} \end{array}

View answer and explanation

Correct option: A

X\, = \,Na,\,\,Y\, = \,Mg

Option D (None is incorrect) is correct because all the given orders are correct regarding the size of ions/atoms.