NCERT Class VII Science Solutions: Chapter 5-Acids, Bases and Salts Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 14:

Paheli is suffering from indigestion due to acidity. Is it advisable to give her orange Juice in this situation and why?

Answer:

No. because orange Juice is acidic in nature. Instead she should be given an antacid which is base and neutralize the acidity. Milk of magnesia contains a base magnesium hydroxide which reacts with the acid and cures indigestion.

SHORT ANSWER QUESTIONS

Question 15:

Look at Figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help.

As Showing in Images is a What Colour is Expected when a Pie …
Nature of Solution and Change in Colour of Red Litmus (Q)
Test TubeNature of SolutionChange in colour

of red litmus

A.Neutral
B.Basic
C.Acidic
D.Neutral

Answer:

Nature of Solution and Change in Colour of Red Litmus (A)
Test TubeNature of SolutionChange in colour

of red litmus

A.NeutralNo change
B.BasicTurn blue
C.AcidicNo change
D.NeutralNo change

Question 16:

While playing in a park, a child was stung by a wasp. Some elders suggested applying paste of baking soda and others lemon Juice as remedy. Which remedy do you think is appropriate and Why?

Answer:

Wasp sting inject a liquid in the skin which is acidic in nature. Hence, baking soda is the appropriate remedy, as it is basic in nature and neutralizes the acid.

Question 17:

Form a sentence using the following words - baking soda, ant bite, moist, effect, neutralized and rubbing.

Answer:

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