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Which One of the Following Alkali Metals Gives Hydrated Salts? - CBSE (Science) Class 11 - Chemistry

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Question

Which one of the following alkali metals gives hydrated salts?

(a) Li

(b) Na

(c) K

(d) Cs

Solution 1

Smaller the size of an ion, the more highly is it hydrated. Among the given alkali metals, Li is the smallest in size. Also, it has the highest charge density and highest polarising power. Hence, it attracts water molecules more strongly than the other alkali metals. As a result, it forms hydrated salts such as 
LiCl.2 H2O. The other alkali metals are larger than Li and have weaker charge densities. Hence, they usually do not form hydrated salts

Solution 2

Li+ is the smallest. Thus, it has the highest charge density and hence attracts the water molecules more strongly.

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 10: The s-Block Elements
Q: 31 | Page no. 306
Solution Which One of the Following Alkali Metals Gives Hydrated Salts? Concept: Group 1 Elements - Alkali Metals.
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