Metallurgy — Chemistry STD 10 — Question

A list of some organic compounds is given below :
List: ethene, ethyne, methanol and methane.
From the list above, name a compound :
(i) Which has a vapour density 14 and turns alkaline potassium permanganate solution colourless?
(ii) Which forms methanoic acid on oxidation in the presence of copper at 200°C?
(iii) Which forms chloroform on halogenation in the presence of sunlight?

Describe what happens to the iron object and the copper rod.

(a) Which feature of ammonia molecule leads to the formation of ammonium ion when ammonia dissolves in water?
(b) Name the other ion formed when ammonia dissolves in water.
(c) Give one test that can be used to detect the presence of the ion produced in (ii).

Write the important uses of acetic acid.

(a) Name the catalyst used in 1(ii)
(b) In the reaction referred to in 1(ii), the catalyst glows red hot. Why?
(c) What is the name of the industrial process which starts with the reaction reffered to in 1 (ii)?

What do you observe when Ammonium solution is added to ferric chloride solution.

The following questions are relevant to the extraction of Aluminium :
(i) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.
(ii) Give a balanced chemical equation for the above reaction.
(iii) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

How would you convert:
(a) Ethene into 1, 2 - dibromoethane.
(b) Ethene to bromoethane