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JEE Main 20137 April
Exam
JEE Main
Year
2013
Date
7 April
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2013 · 7 April · Chemistry · Classification of Elements and Periodicity in Properties

Which of the following represents the correct order of increasing...

Which of the following represents the correct order of increasing first ionization enthalpy for Ca,Ba,S,SeandArCa, Ba, S, Se\text{and}Ar?

Options

  1. ABa<Ca<Se<S<ArBa < Ca < Se < S < Ar
  2. BCa<Ba<S<Se<ArCa < Ba < S < Se < Ar
  3. CCa<S<Ba<Se<ArCa < S < Ba < Se < Ar
  4. DS<Se<Ca<Ba<ArS < Se < Ca < Ba < Ar

Correct answer

A. Ba<Ca<Se<S<ArBa < Ca < Se < S < Ar

Step-by-step solution

Ba<Ca<Se<S<ArBa < Ca < Se < S < Ar


Ba and Ca belong to group IIA ( alkaline earth metals).

Se and S belong to group Vl A (Chalcogens) and as we go down the group ionization enthalpy decreases with increasing atomic size. So,

Ba<CaandSe<SBa < Ca\text{and}Se < S
Ar has stable completely filled electronic configuration and, therefore, has the highest ionization enthalpy.Hence, the correct order is

{Ba<Ca<Se<S<ArinkJmol−15035909419991520\begin{cases} & Ba & < & Ca & < & Se & < & S & < & Ar \\ in{kJmol}^{- 1} & 503 & & 590 & & 941 & & 999 & & 1520\end{cases}

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