Question

Write scientific reasons

a. Graphite is a conductor of electricity.

b. Graphite is not used in ornaments.

c. Limewater turns milky when CO₂ is passed through it.

d. Biogas is an eco-friendly fuel.

Answer 1

a. Graphite is a good conductor of electricity because there are free electrons present between its layers. These free electrons move continuously within the entire layer and thus lead to conduction of electricity.

b. Graphite is not used in making ornaments because it is soft, britlle and slippery. It cannot be moulded like gold and silver and neither does it posess and lusture which is a desired characteritics in jewellery.

c. When carbon dioxide gas is passed through lime water, it turns milky due to the formation of calcium carbonate.

d. Biogas is an eco-friendly fuel because it helps to reduce the greenhouse gas emissions and our dependency on fossil fuels. It is produced from decomposition of organic matter, thus is an effective way of disposal of organic waste.