Question

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.

• A. Solution 1 $\to$ Red, Solution 2 $\to$ Green
• B. Solution 1 $\to$ Green, Solution 2 $\to$ Pink
• C. Solution 1 $\to$ Green, Solution 2 $\to$ Green
• D. Solution 1 $\to$ Red, Solution 2 $\to$ Pink

Answer 1

Answer: (B)

Indicators are substances that are used to test whether a substance is acidic or basic or neutral in nature. They change their colour when added to a solution having acidic or basic substances. A solution of china rose turns green in basic solution and bright pink in acidic medium. So, solution 1 is basic in nature and give green color with china rose while 2 is acidic in nature so gives pink solution. So the first solution is basic and second solution is acidic