ICSE Class 10 Chemistry Case Study based questions – Study of Compounds C. Nitric Acid
On this page we have given ICSE Class 10 Chemistry Chapter 10 Case Study based questions – Study of Compounds C. Nitric Acid. From 2024 Board exam, ICSE will focus on Technical Based, Analytical Based and Critical Questions in Chemistry Exam. So we Net Ex, has started giving Case Study based questions which is also known as Paragraph Based Questions.
Que No. 1 –
The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid.
1.) Write the reactions of KNO3 and NaNO3 with sulfuric acid ?
2.) How the yellow colour of the nitric acid is removed ?
3.) Name A (a liquid), B (a solid) and C (a liquid). (Do not give the formula).
Que No. 2 –
Refer above flow chart and answer the following questions.
1.) Give the names and their composition ratio of chemicals which are used in catalytic chamber.
2.) Give the reaction of oxidation of ammonia to form nitrogen monoxide (Nitric oxide).
3.) How does the absorption tower work and from which material it is made ?
Que No. 3 –
Brown ring test
Refer above figure and answer the following questions
1.) Write the chemical reaction which observe after the addition of Iron [II] sulphate in aq. solution of a nitrate or nitric acid.
2.) What happens when we don’t use fresh solution of ferrous sulphate ?
3.) Write which solution stays below the brown ring and which solution remains above the brown ring.
Answers
Que No. 1 Answers-
1.) 1)KNO3 + H2SO4 → KHSO4 + HNO3
2) NaNO3 + H2SO4 → NaHSO4 + HNO3
2.) (i)If dry air or CO2 is bubbled through the yellow acid, the latter turns colorless because it drives out NO2 from warm acid which is further oxidized to nitric acid.
(ii) By addition of excess of water, nitrogen dioxide gas dissolves in water and thus the yellow colour of the acid is removed.
3.) A) Conc. Sulphuric Acid
B) Sodium or Potassium Nitrate
C) Nitric Acid
Que No. 2 Answers-
1.) A mixture of dry air (free from carbon dioxide and dust particles) and dry ammonia in the ratio of 10:1 by volume, is first compressed and then passed into the catalytic chamber.
2.) 4NH3 + 502 → 4NO + 6H2O+ Heat
3.) The nitrogen dioxide together with the remaining air (sometimes more air is added at this stage) is passed through the absorption tower (a steel tower filled with quartz stone packed in layers), from the top of which warm water trickles. The nitrogen dioxide and oxygen present in the air react with water to form nitric acid.
Quartz is acid resistant and when packed in layers it helps in dissolving nitrogen dioxide uniformly in water.
Que No. 3 Answers-
1.) 6FeSO4 + 3H2SO4 + 2HNO3 → 3Fe₂(SO)3 + 4H₂O + 2NO
FeSO4 + NO → FeSO4NO
(Nitroso ferrous sulphate, a brown compound)
2.) A freshly prepared ferrous sulphate solution is used, because on exposure to the atmosphere, it is oxidized to ferric sulphate which will not give the brown ring.
3.) A freshly prepared ferrous sulphate solution is used, because on exposure to the atmosphere, it is oxidized to ferric sulphate which will not give the brown ring.
The conc. sulphuric acid being heavier settles down and the ferrous sulphate layer remains above it resulting in the formation of a brown ring at the junction.
Also See: Next Chapter Case Based Questions