Science 1 Marks Question

Reaction between sulphuric acid and lime water is neutralisation reaction. Hence, heat will release which will make the reaction mixture hot.

We can not check acidic or basic nature of substance in solid form using litmus paper. We have to make it solution.

No, we should not taste unknown substances. They can harm us.

The effect of an ant bite can be neutralised by rubbing moist baking soda.

(i) Litmus (blue litmus paper)
(ii) Turmeric

(i) Baking soda, (ii) Soap or detergent

The acid is formic acid which is injected into the skin of a person when an ant bites.

Neutralisation reaction.

Lime water (calcium hydroxide) is a basic solution.

Citric acid is present in lemon juice and oxalic acid is present in tomato.

(i) Turmeric, (ii) China rose

The solutions or substances which do not change the colour of either red or blue litmus paper are neutral.

Acids turn blue litmus paper red, while bases turn red litmus paper blue.

The nature of the solution could be basic or neutral, as if it is acidic it would change its colour to red, but instead it remains same.

Distilled water is neither acidic nor basic. When we test its nature through litmus paper strips, we have found neither red nor blue changes in colour which verifies its neutral nature.

Litmus solution is obtained from lichens. It has mauve (purple) colour in distilled water. This solution is used as indicator.

The substances that turn red litmus to blue are basic in nature. Thus, ammonia is basic in nature.

rganic matter is added to the soil to increase its fertility and to help plants grow better.

The colour of phenolphthalein indicator in a basic solution is pink.

If a liquid turns blue litmus red, it is an acid.