During the science activity, class teacher arranged the test tube as shown in the figure and asked students to predict the effect of various indicators on the given solutions.

Which of the following statements are correct?
(i) Turmeric solution will turn red in test tube B and C.
(ii) Litmus solution will turn blue in test tube A.
(iii) Red cabbage extract will turn green in test tube A.
(iv) Litmus solution will turn red in test tubes B and C.

I and II only

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III and IV only

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II, III and IV only

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I, II and IV only

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Solution

The correct option is C II, III and IV only
$∙$ Test tube A contains soap solution which is basic in nature.
$∙$ Test tube B contains a carbonated drink which is acidic in nature as it contains carbonic acid.
$∙$ Test tube C contains vinegar which is acidic in nature as it contains acetic acid.

Let’s discuss the colours shown by the turmeric solution, litmus solution and red cabbage extract in acidic, basic and neutral solutions.

$∙$ Turmeric solution remains yellow in acidic and neutral solutions. It turns red in the basic solutions.
$∙$ Red cabbage extract shows red colour in acidic solutions, green colour in basic solutions and purple colour in neutral solutions.
$∙$ Litmus solution shows red colour in acidic solutions, blue colour in basic solutions and purple colour in neutral solutions.

Let’s analyse the statements given in the question.

$∙$ Turmeric solution will remain yellow in test tube B and C as these solutions are acidic in nature. Therefore, statement I is incorrect.
$∙$ Litmus solution will turn blue in test tube A as solution A is basic in nature. Therefore, statement II is correct.
$∙$ Since solution A is basic in nature, red cabbage extract will turn green in test tube A. Therefore, statement III is correct.
$∙$ Since solutions B and C are acidic in nature, litmus solution will turn red in test tubes B and C. Therefore, statement IV is correct.

Therefore, option C is the correct answer.

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Q. During the science activity, class teacher arranged the test tube as shown in the figure and asked students to predict the effect of various indicators on the given solutions.
Which of the following statements are correct?
I. Turmeric solution will turn red in test tubes

1

and

4

.
II. Methyl orange will turn yellow in test tubes

1

and

3

.
III. China rose indicator will turn dark pink in test tube

2

.
IV. Blue litmus solution will turn red in test tubes

1

and

4

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.

Solution of Soap solution Pure water

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