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

Which metals are liquid at room temperature?

Why are metalloids called semimetals?

Compare the conductivity of metals and non–metals.

The process of adding chlorine in adequate amounts to water is called ______.

______ from the air and sunlight destroy the germs present in water.

Washing soda is used to remove permanent hardness of water.

Temporary and permanent hardness can be removed by the method of boiling.

Match the following:

Name the chemical which converts chlorides and sulphates into insoluble carbonates.

Which of the following is not a natural indicator?

Add a few drops of hibiscus indicator to the soap solution. What do you observe?

Acids and bases can be identified in the laboratory by ______.

Lemon juice will turn ______.

Methyl orange gives ______ colour in an acidic solution.

Neutral substances do not bring about any change in colour of indicators.

Assertion: Methyl orange and phenolphthalein are natural indicators.
Reason: Methyl orange is yellow in colour while phenolphthalein is pink.

What is the colour of phenolphthalein in the basic solution?

Give names of any two natural indicators.

Name the acid present in vinegar.

Name any two synthetic acid-base indicators.