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Q.

Read the following are the statements regarding polarising power of IIA group cationsi) Be mostly forms covalent compounds due to high polarising power of Be+2  ionsii) Be always form covalent compounds due to low polarising power of Be+2  ionsiii) Polarising power of IIA cations decreases from Be+2  ion to Ba+2 ionThe correct combination is

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a

i and ii are correct

b

ii and iii are correct

c

iii and i are correct

d

i, ii, iii are correct

answer is C.

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Detailed Solution

Beryllium ions are very small in size, than any cation in they group, hence they can attract the electron cloud of the anion very easily and undergo the process of polarisazation. Barium ions are very large in size and have weak polarising capacity.
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