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  • Among the statements the correct ones are : (a) Lithium has the highest hydration enthalpy a

Among the statements (a)-(d), the correct ones are :

(a) Lithium has the highest hydration enthalpy 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 H_{2}O.

Option: 1

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


Option: 2

(b) and (c) only


Option: 3

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


Option: 4

(a) and (d) only


Answers (1)

best_answer

(a) Among alkali metals, Li has the highest hydration tendency.

(b) Lithium chloride LiCl is soluble in Pyridine because it has significant covalent character due to high polarising power of lithium.

(c) Li doesn't form ethynide on reaction with ethyne because it has high ionisation enthalpy due to its extremely small size and high polarising power (charge/radius ratio). Its outermost electron is so close to the nucleus, so it is very difficult to remove the electron against the force of attraction applied by its nucleus.

(d) Li and Mg react slowly with water.

Hence, the option number (3) is correct.

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Anam Khan

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