A farmer was unhappy because of his low crop yield. He discussed the problem with an agricultural scientist and realised that the soil of his field was either too acidic or too basic. What remedy would you suggest the farmer to neutralise the soil?

Important Questions on Acids, Bases and Salts

EASY

7th CBSE

IMPORTANT

NCERT Exemplar Science - Class 7>Chapter 5 - Acids, Bases and Salts>LONG ANSWER QUESTIONS>Q 23

You are provided with four test tubes containing sugar solution, baking soda solution, tamarind solution, salt solution. Write down an activity to find the nature (acidic/basic/neutral) of each solution.

EASY

7th CBSE

IMPORTANT

NCERT Exemplar Science - Class 7>Chapter 5 - Acids, Bases and Salts>LONG ANSWER QUESTIONS>Q 24

You are provided with three test tubes A, B and C as shown in figure with different liquids. What will you observe when you put

(a) a piece of blue litmus paper in each test tube.

(b) a piece of red litmus paper in each test tube.

(c) a few drops of phenolphthalein solution to each test tube.

Question Image

EASY

7th CBSE

IMPORTANT

NCERT Exemplar Science - Class 7>Chapter 5 - Acids, Bases and Salts>LONG ANSWER QUESTIONS>Q 25

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which probably caused the fish to die. (a) Explain why the fish were dying. (b) If the factory waste is acidic in nature, how can it be neutralised?

MEDIUM

7th CBSE

IMPORTANT

NCERT Exemplar Science - Class 7>Chapter 5 - Acids, Bases and Salts>LONG ANSWER QUESTIONS>Q 26

Explain two neutralisation reactions related to daily life situation.