GN6002-MP Board-Acids, Bases and Salts -Class 7th

Which of the following has a sour taste and turns blue litmus paper red?

• Salt

• Acid

• Base

• Water

When an acid reacts with a base, a neutral substance called a _______ is formed.

Match the following

• Vinegar

• Tartaric acid

• Tamarind, grapes, unripe mangoes, etc

• Citric acid

• Curd

• Formic acid

• Ant’s sting

• Lactic acid

• Citrus fruits -oranges, lemons, etc

• Acetic acid

Turmeric indicator turns red when added to (a)  

• Basic solution
• Acidic solution
• Neutral solution

Match the following

• Window cleaner

• Calcium hydroxide

• Soap

• Ammonium hydroxide

• Lime water

• Magnesium hydroxide

• Milk of magnesia

• Sodium hydroxide/ Potassium hydroxide

When an acid reacts with a base, what type of reaction occurs?

• Oxidation

• Reduction

• Combustion

• Neutralisation

The gas which escapes out from many aerated soft drinks is _____

If you performed an experiment where different indicators are added to acidic and basic solutions, you might observe that:

• All indicators change color in both solutions

• Some indicators change color in acidic solutions, others in basic solutions

• All indicators remain the same color

• The color change depends on the type of container used

Each cell in our body contains an acid, the (a)   and It controls every feature of the body such as our looks, colour of our eyes, our height etc. Proteins that build part of our cells are also made of ​ ​ (b)   . The fats in our body contain ​ (c)  

• deoxyribonucleic acid
• amino acids
• fatty acids

How soil treatment happens?