TBQ - Reversal of litmus colour change — task. Chemistry CBSE Live product, Class 7 (2026-27).

Pick the suitable answer for the following:

A solution changes red litmus to blue. Which of the following can reverse this change when added in excess?

(i) Carbonic acid
(ii) Sodium chloride solution
(iii) Lemon juice
(iv) Dilute sulphuric acid

(i), (ii), (iii), and (iv)
(i), (iii), and (iv) only
(ii) and (iii) only
(i) and (ii) only

Previous task

Exit to the topic

Next task

Send feedback

Did you find an error?

Send it to us!

5. TBQ - Reversal of litmus colour change

Question: