Match list I with list II
| List I | List II |
| A. Ammonia | I. Ostwald’s process |
| B. Chlorine | II. Contact process |
| C. Sulphuric Acid | III. Deacon process |
| D. Nitric Acid | IV. Haber’s process |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → A-IV, B-III, C-II, D-I
A. Ammonia — This matches IV. Haber’s process. Nitrogen and hydrogen combine over an iron oxide catalyst (with small amounts of \( \ce{K2O} \) and \( \ce{Al2O3} \)) at about 700 K and 200 × 105 Pa.
\( \ce{N2(g) + 3H2(g) <=> 2NH3(g)} \)
B. Chlorine — This matches III. Deacon process. Hydrogen chloride is oxidised by atmospheric oxygen in the presence of \( \ce{CuCl2} \) (catalyst) at 723 K.
\( \ce{4HCl + O2} \xrightarrow[\text{723 K}]{\ce{CuCl2}} \ce{2Cl2 + 2H2O} \)
C. Sulphuric Acid — This matches II. Contact process. Sulphur dioxide is oxidised to sulphur trioxide over \( \ce{V2O5} \); the \( \ce{SO3} \) is absorbed in \( \ce{H2SO4} \) to give oleum, which is diluted with water to the required strength.
\( \ce{2SO2(g) + O2(g)} \xrightarrow{\ce{V2O5}} \ce{2SO3(g)} \)
\( \ce{SO3 + H2SO4 -> H2S2O7} \) (oleum)
\( \ce{H2S2O7 + H2O -> 2H2SO4} \)
D. Nitric Acid — This matches I. Ostwald’s process. Ammonia is oxidised by air over a Pt/Rh gauze catalyst at 500 K and 9 bar; the nitric oxide formed is oxidised to \( \ce{NO2} \), which dissolves in water to give nitric acid.
\( \ce{4NH3(g) + 5O2(g)} \xrightarrow[\text{500 K, 9 bar}]{\text{Pt/Rh gauze}} \ce{4NO(g) + 6H2O(g)} \)
\( \ce{2NO(g) + O2(g) <=> 2NO2(g)} \)
\( \ce{3NO2(g) + H2O(l) -> 2HNO3(aq) + NO(g)} \)
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.