Question

Smita carried out some experiments with china rose petals. She placed china rose petals in a beaker and added some hot water. 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.

A) X-Base, Y-Indicator, Z-Acid
B) X-Indicator, Y-Acid, Z-Base
C) X-Acid, Y-Base, Z-Indicator
D) X-Acid, Y-Indicator, Z-Base

Answer 1

Hint:To solve this we must know that china rose is an indicator. Substances that change their colours in the presence of an acid or a base are known as indicators. In a neutral solution, indicators do not show any colour change.

 Complete answer:We know that china rose is a natural indicator. Indicators are obtained from nature and are known as natural indicators.
-China rose is a natural indicator. Originally, the china rose indicator is pink in colour. China rose solution turns dark pink (red) when dipped in acid and turns green when dipped in the base.
We are told that Smita carried out some experiments with china rose petals. She placed china rose petals in a beaker and added some hot water. This is the china rose extract.
Later Smita divided this solution into three test tubes and added acid to one, base to another and left the third one as such.
-We know that china rose solution turns dark pink (red) in colour when dipped in an acid. Thus, the test tube containing red coloured solution contains an acid. Thus, X-Acid.
We know that originally the china rose solution is pink in colour. Thus, the test tube containing pink coloured solution contains only the indicator. Thus, Y-Indicator.
We know that china rose solution turns green in colour when dipped in a base. Thus, the test tube containing green coloured solution contains a base. Thus, Z-Base.

Thus, the correct match for the solution in each test tube is X-Acid, Y-Indicator, Z-Base.

Thus, the correct option is (D) X-Acid, Y-Indicator, Z-Base.
Note: Substances that change their colors in the presence of an acid or a base are known as indicators. In a neutral solution, indicators do not show any color change. A few examples of natural indicators are litmus, turmeric etc.