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JEE Main 20202 SeptemberEvening Shift

Exam: JEE Main
Year: 2020
Date: 2 September
Shift: Evening Shift
Subject: Chemistry
Chapter: s Block Elements

JEE Main 2020 · 2 September · Evening Shift · Chemistry · s Block Elements

Two elements A and B have similar chemical properties. They don't...

Two elements

A

and

B

have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides.

A

and

B

, respectively, are :

Options

A $Na$ and $Rb$
B $Na$ and $Ca$
C $Cs$ and $Ba$
D $Li$ and $Mg$

Correct answer

D. $Li$ and $Mg$

Step-by-step solution

Li

and

Mg

do not form solid bicarbonate. But react with

{N}_{2}

to give nitrides. Both of them have similar properties due to diagonal relationship.

6Li + {N}_{2}\overset{\Delta}{⟶}2{Li}_{3}N

3Mg + {N}_{2}\overset{\Delta}{⟶}{Mg}_{3}{N}_{2}

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