pBlock ElementsII 1 Question 83
78. The Haber’s process can be represented by the following scheme.
Identify $A, B, C, D$ and $E$.
$(1999,5 M)$
79 (a) In the following equation
$$ \begin{aligned} & \qquad A+2 B+\mathrm{H}{2} \mathrm{O} \longrightarrow C+2 D \ & \left(A=\mathrm{HNO}{2}, B=\mathrm{H}{2} \mathrm{SO}{3}, C=\mathrm{NH}_{2} \mathrm{OH}\right) \ & \text { Identify } D \text {. Draw the structures of } A, B, C \text { and } D \text {. } \end{aligned} $$
(b) In the contact process for industrial manufacture of sulphuric acid, some amount of sulphuric acid is used as a starting material. Explain briefly. What is the catalyst used in the oxidation of $\mathrm{SO}_{2}$ ?
(1999, 10M)
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Solution:
- In given scheme : $A=\mathrm{Ca}(\mathrm{OH})_{2}$
$B=\mathrm{NH}{4} \mathrm{HCO}{3}, C=\mathrm{Na}{2} \mathrm{CO}{3}$
$D=\mathrm{NH}{4} \mathrm{Cl}$ and $\mathrm{E}=\mathrm{CaCl}{2}$
