FRANK Solutions for Class 10 Chemistry Chapter 9 - B - Nitric Acid
Get complete access to Frank Solutions for ICSE Class 10 Chemistry Chapter 9 B − Nitric Acid at TopperLearning. Learn to explain Ostwald’s process to prepare nitric acid along with a labelled diagram. Revise the properties and applications of nitric acid with our detailed Chemistry solutions.
In this ICSE Class 10 Chemistry chapter, you will also practise the balancing of certain Chemistry equations. For your board exam, you can prepare MCQs and various short answer questions by revising our textbook solutions and by attempting our online practice tests. You can check our Chemistry doubts and solutions, concept videos and question papers too.
Chapter 9B - Nitric acid Exercise 235
Chapter 9B - Nitric acid Exercise 236
Chapter 9B - Nitric acid Exercise 237
(iv) Platinum gauze
(i) Aqua regia is a mixture of nitric acid and hydrochloric acid.
(ii) Fuming nitric acid is obtained by dissolving excess of nitrogen oxide in conc. nitric acid.
(iii) 98% nitric acid is obtained by distilling 68% nitric acid with conc. H2SO4 under pressure.
(iv) Ammonal is a mixture of ammonium nitrate and aluminium powder.
(v) 3Cu + 8HNO3 (dilute) → 3Cu(NO3)2 + 4H2O + 2NO
Chapter 9B - Nitric acid Exercise 238
When concentrated nitric acid is added to copper brown fumes of nitrogen dioxide are observed.
(i) Nitrogen dioxide
(ii) Ammonia gas
Chapter 9B - Nitric acid Exercise 239
Chapter 9B - Nitric acid Exercise 240
(i) The complete apparatus should be made of glass only.
(ii) At high temperature, nitric acid decomposes and the glass apparatus may get damaged. Sodium formed at a higher temperature forms a hard crust which sticks to the walls of the retort.
Brown fumes of nitrogen dioxide are produced. Copper reacts with concentrated nitric acid to produce copper nitrate, water and nitrogen dioxide.
(i) When sulphur is treated with conc. nitric acid, it produces nitrogen dioxide.
(i) Dilute nitric acid is generally considered a typical acid except for its reaction with metals because it does not liberate hydrogen. It is a powerful oxidising agent, and nascent oxygen formed oxidises hydrogen in water.
(ii) Although pure concentrated nitric acid is colourless, it appears yellow when left standing in a glass bottle due to the dissolution of reddish brown nitrogen dioxide gas in the acid. Nitrogen dioxide is produced because of the thermal decomposition of a portion of nitric acid.
4HNO3 → 2H2O + 4NO2 + O2
(iii) An all-glass apparatus is used in the laboratory preparation of nitric acid because nitric acid vapour corrodes rubber and cork.
(i) Cold, dilute nitric acid reacts with copper to give nitric oxide.
(ii) Hot, concentrated nitric acid reacts with sulphur to form nitrogen dioxide.
(i) 3Cu + 8HNO3→ 3Cu(NO3)2 + 4H2O+ 2NO↑
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