Analytical Chemistry — Chemistry STD 10 — Question

Name a substance which when dissolved in water contains (i) only ions (ii) ions and molecules.

Distinguish by adding : sodium hydroxide solution and ammonium hydroxide solution to : Copper salt solution and ferrous salt solution

Write a balanced chemical equation : when hot and concentrated sulphuric acid reacts with the following :
Sugar

Write the equation for the action of heat on Ammonium nitrate.
State whether the reaction is an example of thermal decomposition or thermal dissociation.

Define the term : Avogadro's number

Give reason for the following:
When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.

You have been provided with three test tubes. One of them contains distilled water and the other two have an acidic solution and a basic solution respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?

Give four substances which contain water of crystallization and write their common name.

(a) Concentrated sulphuric acid should be kept in air-tight bottles. Why?
(b) Write a balanced equation for the preparation of sulphur dioxide by the action of hot conc. sulphuric acid on sulphur.

What is meant by the following term?
Aqua regia