Among the statements (a) – (d) , the correct ones are
a) Lithium has the highest hydration enthalphy among the alkali metals
b) Lithium chloride is insoluble in pyridine
c) Lithium cannot form ethynide upon its reaction with ethyne
d) Both lithium and magnesium react slowly with H₂O .

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(a), (c) and (d) only

(b) and (c) only

(a), (b) and (d) only

(a) and (d) only

answer is C.

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Detailed Solution

Lithium has the highest hydration enthalpy among alkali metals because it has smallest size and highest charge density
Lithium chloride is soluble in pyridine this is so because lithium chloride is a covalent compound
Lithium cannot form ethynide upon its reaction with ethyne because it has a small size and high ionization energy which makes it difficult to remove the outermost electron.
Both lithium and magnesium react slowly with because Lithium and Magnesium have less density than water