Study of Compounds-I Hydrogen Chloride — Chemistry STD 10 — Question

(a) What do you understand by the term covalent compound?
(b) Name two covalent compounds, showing clearly the bond/bonds between two participating atoms.

Write the equations for the reactions, which takes place at the electrodes during the electrolysis of lead bromide?

A balloon is filled with hydrogen gas (H₂) at a pressure of 1.5 atm and a temperature of 350 K. The balloon is then placed in a cooler environment where the temperature drops to 250 K, while the volume of the balloon remains constant.
(i) Determine the final pressure of the hydrogen gas in the balloon.
(ii) Explain why the pressure changes when the temperature changes, according to Gay Lussac's Law.

How are the following conversion brought about? Give equation and condition:
Sucrose to sugar charcoal.

If 100 cm³ of oxygen contains Y molecules, how many molecules of nitrogen will be present in 50 cm³ of nitrogen under the same conditions of temperature and pressure.

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound. But, both conducts electricity in their aqueous solutions. Explain.

Define the term: Vapour density.

(a) A solution of silver nitrate is a good electrolyte but is not used for electroplating an article with silver. Give reason.
(b) To carry out the so called "electrolysis of water", sulphuric acid is added to water. How does the addition of sulphuric acid produce a conducting solution?