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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which of the following group does not represent the isoelectronic species?
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Correct option: D
H2 S, K+,Ar,Cl\mathrm{H}_2 \mathrm{~S}, \mathrm{~K}^{+}, \mathrm{Ar}, \mathrm{Cl}
The correct answer is D (H2 S, K+,Ar,Cl\mathrm{H}_2 \mathrm{~S}, \mathrm{~K}^{+}, \mathrm{Ar}, \mathrm{Cl}) because these species do not all have the same number of electrons. H2 S, K+\mathrm{H}_2 \mathrm{~S}, \mathrm{~K}^{+}, and Ar\mathrm{Ar} have 18 electrons, but Cl\mathrm{Cl} has 17.

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The compounds of the s-block elements, with the exception of lithium and ... XX... are predominantly ionic. Here, XX refers to Among the following elements, the most electronegative is: The pair of amphoteric hydroxides is The element with atomic number 117 if discovered would be placed in The correct order of size among O,O2−,F\mathrm{O}, \mathrm{O}^{2-}, \mathrm{F} and F−\mathrm{F}^{-} is: The electronic configuration of four elements are given below. Which elements does not belong to the same family as others?
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