Q. 204.5( 6 Votes )
Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour. Boojho added two drops of solution ‘A’ in his test tube and got dark pink colour. Paheli added 2 drops of solution ‘B’ to her test tube and got green colour. Golu added 2 drops of solution ‘C’ but could not get any change in colour. Suggest the possible cause for the variation in their results.
A solution of china rose turns green in a basic solution, and bright pink or magenta in an acidic solution. Since after addition of solution ‘A’ by Boojho, the testube solution became dark pink, hence we can conclude that it contained basic solution. Similarly, Paheli’s Solution ‘B’ contains acid because it turns china rose green. Since no color change was observed using Solution ‘c’ it is neutral.
So Solution A = Base
Solution B= Acid and Solution C= neutral.
Rate this question :
Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labeled. He has to serve the drinks on the demand of customers. One customer wants acidic drink; another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?NCERT Science
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.NCERT Science
Look at Figure 5.1 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.
NCERT - Exemplar Science
Which of the following is an acid-base indicator?NCERT - Exemplar Science
A solution changes the colour of turmeric indicator from yellow to red. The solution isNCERT - Exemplar Science
‘Litmus’, a natural dye is an extract of which of the following?NCERT - Exemplar Science
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively areNCERT - Exemplar Science
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observedNCERT - Exemplar Science
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?NCERT - Exemplar Science
Fill in the cross word given as Figure 5.2 with the help of the clues provided.
(2) The solution which does not change the colour of either red or blue litmus.
(4) Phenolphthalein gives pink colour in this type of solution.
(7) Colour of blue litmus in lemon juice.
(1) It is used to test whether a substance is acidic or basic.
(3) It is a natural indicator and gives pink colour in basic solution.
(5) Nature of ant’s sting.
(6) It is responsible for increase in temperature during a neutralisation reaction.NCERT - Exemplar Science