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Standard XII
Chemistry
Question

Smita carried out some experiments with china rose petals. She placed china rose petals in a beaker and added some hotwater. She divided this solution into three test tubes and added acid to one, base to another and left the third one as such. But she forgot to label these test tubes. Identify the correct match for the solution in each test tube.
319387_f5f049ec8a2a4e9fb7680cb0efecf462.png
  1. X - Base, Y - Indicator, Z - Acid
  2. X - Indicator, Y - Acid, Z - Base
  3. X - Acid, Y - Base, Z - Indicator
  4. X - Acid, Y - Indicator, Z - Base

A
X - Indicator, Y - Acid, Z - Base
B
X - Acid, Y - Indicator, Z - Base
C
X - Base, Y - Indicator, Z - Acid
D
X - Acid, Y - Base, Z - Indicator
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Solution
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China Rose : Extract of china rose (Gudhal) petals is of pink colour. It will change into dark pink (magenta) in acidic solution and green in basic solution.

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Similar Questions
Q1
Smita carried out some experiments with china rose petals. She placed china rose petals in a beaker and added some hotwater. She divided this solution into three test tubes and added acid to one, base to another and left the third one as such. But she forgot to label these test tubes. Identify the correct match for the solution in each test tube.
319387_f5f049ec8a2a4e9fb7680cb0efecf462.png
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Q2
A student took solution X in a test-tube and added a few drops of universal indicator to it. The solution turned blue. On adding another solution Y to this test-tube drop-wise, the colour of solution changed to green. When a yet another solution Z was added, the solution turned yellow. Which of the following gives the correct conclusion of the student?
(1) X is acid, Y is base, Z is salt solution
(2) X is base, Y is acid, Z is acid
(3) X is acid, Y is base, Z is base
(4) X is base, Y is acid, Z is sugar solution
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Q3
What colour does china rose indicator gives witha acid and bases?
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Q4
The colored petals of some flowers indicate the presence of acid or base in a solution. Example of such flowers is:
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Q5
Ms. Chopra, a science teacher prepared two solutions for practical test as follows:
Solution 1 : Dissolved the ash collected after burning the magnesium ribbon in water.
Solution 2 : Added dilute sulphuric acid to lime water. She asked a student to test the solutions with china rose indicator and write the change in colour.
Choose the correct observation among the following.

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