First slide

Anomalous behaviour of Lithium, Diagonal Relationship with Mg

Question

Statement-I: Lithium cannot react with Ethyne
Statement-II: Lithium cannot react with Nitrogen

Moderate

A

Both statements I and II are correct
B

Statement I is correct and statement II is incorrect
C

Statement I is incorrect and statement I is correct
D

Both statements I and II are incorrect

Solution

Alkali metals are active metals. They react with active H-compounds like $H_{2} O$ , RCOOH, HCl, ROH and $HC \equiv CH$ . Lithium cannot react with Ethyne to form ethynide .Lithium can react directly with carbon .
No alkali metals except lithium can directly combine with $N_{2}$ .
$6 Li + N_{2} \to 2 {Li}_{3} N$

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