02. Acidic,Basic, and neutral Chapter Solution
Q1. A solution turns the red litmus paper to blue. Excess addition of which of the following solution would reverse
the change?
(i) Lime water
(ii) Baking soda
(iii) Vinegar
(iv) Common salt solution
Answer: (iii) Vinegar.
Vinegar is acidic and would turn the blue litmus paper back to red, reversing the effect caused by the
basic solution.
, Q2. You are provided with three unknown solutions labelled A, B, and C, but you do not know which of these are
acidic, basic, or neutral. Upon adding a few drops of red litmus solution to solution A, it turns blue. When a few
drops of turmeric solution are added to solution B, it turns red. Finally, after adding a few drops of red rose extract
to solution C, it turns green.
Based on the observations, which of the following is the correct sequence for the nature of solutions A, B, and C?
(i) Acidic, acidic, and acidic
(ii) Neutral, basic, and basic
(iii) Basic, basic, and acidic
(iv) Basic, basic, and basic
Answer:
(iv) Basic, basic, and basic.
Solution A: Red litmus turns blue, indicating a basic solution, as bases turn red litmus blue. This is
correct.
Solution B: Turmeric solution turns red. Turmeric turns red in basic solutions and remains yellow in
acidic or neutral solutions. Solution B must be basic.
Solution C: Red rose extract turns green, indicating an basic solution.Thus, the correct sequence is:
Therefore, Solution A is basic, B is basic and C is also Basic
Q3. Observe and analyse Figs. 2.13, 2.14, and 2.15, in which red rose extract paper strips are used. Label the nature
of solutions present in each of the containers.
Answer: Red rose extract turns red in acidic solutions and green in basic solutions.
Fig. 2.13: The red rose extract paper strip turns green in the solution. This indicates that the solution is basic.
Q1. A solution turns the red litmus paper to blue. Excess addition of which of the following solution would reverse
the change?
(i) Lime water
(ii) Baking soda
(iii) Vinegar
(iv) Common salt solution
Answer: (iii) Vinegar.
Vinegar is acidic and would turn the blue litmus paper back to red, reversing the effect caused by the
basic solution.
, Q2. You are provided with three unknown solutions labelled A, B, and C, but you do not know which of these are
acidic, basic, or neutral. Upon adding a few drops of red litmus solution to solution A, it turns blue. When a few
drops of turmeric solution are added to solution B, it turns red. Finally, after adding a few drops of red rose extract
to solution C, it turns green.
Based on the observations, which of the following is the correct sequence for the nature of solutions A, B, and C?
(i) Acidic, acidic, and acidic
(ii) Neutral, basic, and basic
(iii) Basic, basic, and acidic
(iv) Basic, basic, and basic
Answer:
(iv) Basic, basic, and basic.
Solution A: Red litmus turns blue, indicating a basic solution, as bases turn red litmus blue. This is
correct.
Solution B: Turmeric solution turns red. Turmeric turns red in basic solutions and remains yellow in
acidic or neutral solutions. Solution B must be basic.
Solution C: Red rose extract turns green, indicating an basic solution.Thus, the correct sequence is:
Therefore, Solution A is basic, B is basic and C is also Basic
Q3. Observe and analyse Figs. 2.13, 2.14, and 2.15, in which red rose extract paper strips are used. Label the nature
of solutions present in each of the containers.
Answer: Red rose extract turns red in acidic solutions and green in basic solutions.
Fig. 2.13: The red rose extract paper strip turns green in the solution. This indicates that the solution is basic.
