Science 1 Marks Question

Basic.

To prepare lime water, dissolve some lime (chuna) in water in a bottle. Stir the solution and keep it for sometime. Pour a little more from the top. This is lime water.

Acid rain can cause damage to buildings, historical monuments, plants and animals.

Bases are bitter in taste.

Baking soda.

Lichens.

False.

Yes, an acidic solution conducts electricity.

When an acidic solution is mixed with a basic solution, they each neutralise other forming salt and water.Note: This reaction is called neutralisation reaction.

The deoxyribonucleic acid.

Formic acid.

Citric acid.

• Baking soda.
• Soap or detergent.

Lactic acid.

It is because the soap solution is basic.

When hydrochloric acid reacts with sodium hydroxide solution, then sodium chloride salt is formed.

False.
Some substances, are neutral like water, table salt etc.

The Distilled water is neutral. It is neither sour (Acidic) nor bitter (Basic), to very its chemical nature, we can perform litmus test. It neither turns blue litmus red nor red litmus blue hence we can say, distilled water is a neutral substance.

An indicator is a special chemical that changes its colour to indicate the presence of a chemical substance whether it is acidic or basic.

Copper and brass vessels on reacting with acids get corroded. Kalai prevents their corrosion.

Turmeric stain on white shirt is turned to red when it is washed with soap because the soap solution is basic in nature.

We should take great care while handling acids and bases because these are corrosive in nature, irritating and harmful to skin.

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

A salt derived from more than one acid or more than one base is called mixed salt. Example: bleaching powder, potash alum etc.

False.
Acids do not turn all indicators red, e.g. China rose indicator turns to dark pink (magenta) when acidic compound is added to it.

False.
Common salt and water both are neutral hence, have no effect on litmus.

False.

• Turmeric.
• China rose.

Sodium bicarbonate neutralises the acidity in the stomach. Hence, it is used during indigestion. Lemon contains acid. It reacts with undigested food and suffers it.

The acids which are found in plants and animals are called organic acids, for example vinegar contains acetic acid, lemon juice contains citric acid etc.

The rain becomes acidic due to dissolution of carbon dioxide, sulphur dioxide and nitrogen dioxide in rain drops to form carbonic acid, sulfuric acid and nitric acid respectively.