Page 258 - Chemistry ICSE Class X

244 ICSE Chemistry – 10

Let us Answer Some More Questions

1. How does nitric acid occur in nature in the combined form?
2. Write the balanced equation for the preparation of nitric acid from nitre. Mention conditions of the reaction also.
3. Write the chemical name and formula of the following: (a) Aqua fortis (b) Chile saltpetre (c) Nitre
4. (a) Write a chemical equation to illustrate the acidic nature of nitric acid.
(b) Name the products formed when ammonium nitrate is heated.
5. Nitric acid is manufactured by Ostwald’s process.
(a) Give the source of ammonia gas used in the manufacture.
(b) What is the ratio of ammonia and air taken in this process?
(c) Name the catalyst used in the process.
(d) Name the oxidising agent used in the process.
6. Give reasons for the following:
(a) The apparatus for the preparation of nitric acid by heating concentrated sulphuric acid and potassium
nitrate, should be all glass.
(b) Name all the products formed when ammonium nitrate is heated.
7. Correct the following, if required
(a) HNO is a strong reducing agent.
3
(b) NaNO gives NO and O on heating.
2
3
2
(c) Constant boiling nitric acid contains 80% nitric acid by mass.
(d) Nitric acid remains colourless even when exposed to light.
8. Write equation for the following conversions A, B and C:

9. Name the oxidised products formed when nitric acid is added to
(a) Potassium iodide (b) Hydrogen sulphide (c) Sulphur dioxide
(d) Zinc metal (e) Phosphorus
10. When conc. nitric acid is reacted with copper and carbon, a brown gas is given out.
(a) Name the brown gas.
(b) State the property of nitric acid shown in this reaction.
11. X, Y and Z are three crystalline solids which are soluble in water and have a common anion.
To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and
complete the corresponding inferences in (a) to (f).
(a) A reddish-brown gas is obtained when X, Y and Z are separately heated with concentrated sulphuric acid
and copper-turning added to the mixture.
Inference 1. The common anion is the ___________ ion.
(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.
Inference 2. The cation in X is either ___________ or ___________ .
(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the
tube.
Inference 3. The metal ion present in Y is the ___________ ion.
(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which
turns moist red litmus paper blue.
Inference 4. Z contains the ___________ cation.