Give an example of a synthetic indicator.

Important Questions on Acids, Bases and Salts

EASY

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q I

_____ indicator is yellow in basic solution.

EASY

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q I

_____ gives magenta colour in acidic solutions. (Turmeric/ China rose)

MEDIUM

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q II

When dilute sulphuric acid is added to lime water, will the reaction mixture be hot or cool?

MEDIUM

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q II

How will you test whether a given solution is acidic, basic or neutral with a turmeric indicator?

MEDIUM

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q III

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

MEDIUM

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q III

Why does a pink colour appear upon gradually adding sodium hydroxide to a solution of acid having $2-3$ drops of phenolphthalein?

HARD

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>Exercise 5.3>Q IV

With the help of an activity, determine the nature of the given solution (basic, acidic or neutral) using litmus paper.

MEDIUM

7th CBSE

IMPORTANT

Exam Guru Science>Chapter 5 - Acids, Bases and Salts>HOTS AND VALUE BASED QUESTIONS>Q 1

If you get a turmeric stain on your clothes while eating food and try to wash it with soap, the stain becomes red. Why?