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JEE MAIN 2021
26-02-2021 S1
Question
Find $\mathrm{A}, \mathrm{B}$ and C in the following reactions : $$ \begin{aligned} & \mathrm{NH}_3+\mathrm{A}+\mathrm{CO}_2 \rightarrow\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \\ & \left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3+\mathrm{H}_2 \mathrm{O}+\mathrm{B} \rightarrow \mathrm{NH}_4 \mathrm{HCO}_3 \\ & \mathrm{NH}_4 \mathrm{HCO}_3+\mathrm{NaCl} \rightarrow \mathrm{NH}_4 \mathrm{Cl}+\mathrm{C} \end{aligned} $$
Select the correct option:
A
$\mathrm{A}-\mathrm{O}_2 ; \mathrm{B}-\mathrm{CO}_2 ; \mathrm{C}-\mathrm{Na}_2 \mathrm{CO}_3$
B
$\mathrm{A}-\mathrm{H}_2 \mathrm{O} ; \mathrm{B}-\mathrm{O}_2 ; \mathrm{C}-\mathrm{Na}_2 \mathrm{CO}_3$
C
$\mathrm{A}-\mathrm{H}_2 \mathrm{O} ; \mathrm{B}-\mathrm{O}_2 ; \mathrm{C}-\mathrm{NaHCO}_3$
D
$\mathrm{A}-\mathrm{H}_2 \mathrm{O} ; \mathrm{B}-\mathrm{CO}_2 ; \mathrm{C}-\mathrm{NaHCO}_3$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
$\begin{aligned} & 2 \mathrm{NH}_3+\underset{(\mathrm{A})}{\mathrm{H}_2 \mathrm{O}}+\mathrm{CO}_2 \longrightarrow\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3 \\ & \left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3+\mathrm{H}_2 \mathrm{O}+\underset{\text { (B) }}{\mathrm{CO}_2} \longrightarrow 2 \mathrm{NH}_4 \mathrm{HCO}_3 \\ & \mathrm{NH}_4 \mathrm{HCO}_3+\mathrm{NaCl} \longrightarrow \underset{\text { (C) }}{\mathrm{NaCO}}+\mathrm{NH}_4 \mathrm{Cl}\end{aligned}$
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