SSLC (English Medium) Class 8 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

Iron objects undergo rusting when exposed to _______ and _______.

Electrolysis of brine solution gives _______ gases.

Decomposition of lead nitrate is an example for a chemical reaction caused by light.

Formation of slaked lime from quicklime is an endothermic reaction.

Light energy may come out due to chemical reactions.

Match the following.

What is pollution?

What happens to the brine during electrolysis?

On heating, calcium carbonate gives calcium oxide and oxygen. Is it an exothermic reaction or an endothermic reaction?

Explain any three conditions that are required for a chemical reaction to take place. Give example.

Palanikumar is a Lawyer. He lives in a luxurious flat. Due to high rent, he wants to shift his residence to a place where he has a chemical industry nearby. There the rent is very cheap and the area is less populated also. His son Rajasekar, studying VIII, does not like this and likes to go to some other place.

1. Is Rajasekar right in his attitude?
2. Why did he refuse to go there?
3. What are the values shown by Rajasekar?

Define the following.

Freezing point

Define the following.

Boiling point

Write any four physical properties of base.

What are the uses of bases?

Anthracite is known as the highest-grade coal. Give reason.

Explain the different types of coal.

______ is a prokaryotic microorganisms.

Based on shape, the bacteria are classified into _______ types.

Bacteria, which has a flagellum at one end is classified as _______.