KVPY 2020-21 SA Exam Previous Papers

Question : 42 of 80

Marks: +1, -0

The covalent characters of

CaCl_2, BaCl_2

SrCl_2

and

MgCl_2

follow the order:

$CaCl_2 < BaCl_2 < SrCl_2 < MgCl_2$
$BaCl_2 < SrCl_2 < CaCl_2 < MgCl_2$
$CaCl_2 < BaCl_2 < MgCl_2 < SrCl_2$
$SrCl_2 < MgCl_2 < CaCl_2 < BaCl_2$

Validate

Solution:

• With increase in size of cation, their polarising power decreases hence covalent character of chlorides alsodecreases.
• So, correct order of covalent characters is

BaCl_2 < SrCl_2 < CaCl_2 < MgCl_2

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