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Periodic Table and Periodicity question

2022 · Q122
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Periodic Table and Periodicity question

2022 · Q122

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1

If first ionization enthalpies of elements X and Y are 419 kJ mol−-−1 and 590 kJ mol−-−1, respectively and second ionization enthalpies of X and Y are 3069 kJ mol−-−1 and 1145 kJ mol−-−1, respectively. Then correct statement is :

  1. A
    Both X and Y are alkaline earth metals
  2. B
    X is an alkali metal and Y is an alkaline earth metal
  3. C
    X is an alkaline earth metal and Y is an alkali metal
  4. D
    Both X and Y are alkali metals
View written solutionFree

Correct answer: B

As it can be observed from given data of question, in case of element 'X' there is huge difference between IP1 and IP2 hence it will have one electron in outermost shell and will be alkali metal.

While for 'Y' difference is not that high hence it will be alkaline earth metal.

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