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JIPMER 2007
Exam
JIPMER
Year
2007
Subject
Chemistry
Chapter
s Block Elements

JIPMER 2007 · Chemistry · s Block Elements

The correct sequence of increasing covalent character is...

The correct sequence of increasing covalent character is represented by

Options

  1. ALiCl<NaCl<BeCl2\mathrm{LiCl} \lt \mathrm{NaCl} \lt \mathrm{BeCl}_2
  2. BBeCl2<NaCl<LiCl\mathrm{BeCl}_2 \lt \mathrm{NaCl} \lt \mathrm{LiCl}
  3. CNaCl<LiCl<BeCl2\mathrm{NaCl} \lt \mathrm{LiCl} \lt \mathrm{BeCl}_2
  4. DBeCl2<LiCl<NaCl\mathrm{BeCl}_2 \lt \mathrm{LiCl} \lt \mathrm{NaCl}

Correct answer

C. NaCl<LiCl<BeCl2\mathrm{NaCl} \lt \mathrm{LiCl} \lt \mathrm{BeCl}_2

Step-by-step solution

On the basis of Fajan's rule, lower the size of cation higher will be its polarising power and higher will be covalent character. ∴\therefore Polarising power ∝1 size of cation \propto \frac{1}{\text{ size of cation }} Covalent character ∝\propto Polarising power So the correct order is NaCl<LiCl<BeCl2\mathrm{NaCl} \lt \mathrm{LiCl} \lt \mathrm{BeCl}_2 (The order of size of cation Na+>Li+>Be2+\mathrm{Na}^{+}\gt\mathrm{Li}^{+}\gt\mathrm{Be}^{2+} )
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