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BITSAT 2021

Exam: BITSAT
Year: 2021
Subject: Chemistry
Chapter: s Block Elements

BITSAT 2021 · 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

\mathrm{Mg}

do not form solid bicarbonate, but react with

\mathrm{N}_{2}

to give nitrides.

\begin{array}{l} 6 \mathrm{Li}+\mathrm{N}_{2} \stackrel{\Delta}{\rightarrow} 2 \mathrm{Li}_{3} \mathrm{ N} \\ 3 \mathrm{Mg}+\mathrm{N}_{2} \stackrel{\Delta}{\rightarrow} \mathrm{Mg}_{3} \mathrm{ N}_{2} \end{array}

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