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Q.

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

(a ) and (d) only

b

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

c

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

d

(b) and ( c ) only

answer is C.

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Detailed Solution

‘Li’ has more covalent character. So it is soluble in pyridine and it has high heat of hydration ‘Li’ cannot form ethynide with ethyne. ‘H’ Mg reacts with H2O gives respective hydroxides.

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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 .