SSLC (English Medium) इयत्ता ८ - Tamil Nadu Board of Secondary Education Question Bank Solutions

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.

How will you prepare a china rose indicator?

Write a note on:

Litmus

Write a note on:

Phenolphthalein

Write a note on:

Methyl orange

Take some lemon juice in a tumbler and add baking soda slowly. What do you see? What do you infer from this?

Take a shirt with turmeric powder strain. Wash the shirt with soap. Do you observe any change in the colour? Why?

Take a small beetroot vegetable and cut it into pieces. Boil them in hot water and filter the extract. Take two test tubes. Take sodium hydroxide solution in one test tube and vinegar or lemon juice in another test tube. Add beetroot extract slowly. Observe the colour change. What do you infer?

Hydrogen gas obtained from natural gas is used in the production of ______.

The process of separating petroleum into useful by-products and removal of undesirable impurities is called distillation.

______ is not a fungus.

The range of audible frequency for the human ear is

Assertion: People struck by lightning receive a severe electrical shock.

Reason: Lightning carries very high voltage.