The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?
(i) Na
(ii) K
(iii) Rb
(iv) Cs
The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?
(i) Na
(ii) K
(iii) Rb
(iv) Cs
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1 Answer
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This is a multiple choice type question as classified in NCERT Exemplar
Correct Option (iv)
In alkali metals, on going down the group, as the metallic strength decreases, melting point decreases. Thus, Cs has the lowest melting point and melts at 30°C.
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Li+ has the highest hydration enthalpy.
Hence it is most hydrated
Therefore, Correct order of hydrated radii is Cs+ < Rb+ < K+ < Na+ < Li+
Sodium carbonate is a white crystalline solid which exists as a decahydrate, 
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