CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 48

Total: 60

50.0‌mL of tap water was taken in a beaker. Hydrochloric acid was added drop by drop to water. The temperature and pH of the solution was noted. The following graph was obtained. Choose the correct statements related to this activity.
(i) The process of dissolving an acid in water is highly endothermic.
(ii) The pH of the solution increases rapidly on addition of acid.
(iii) The pH of the solution decreases rapidly on addition of acid.
(iv) The pH of tap water was around 7.0.

(i) and (ii)
(i) and (iii)
(iii) and (iv)
(ii) and (iv)

Solution:

When hydrochloric acid was added drop by drop to a 50‌ml solution of tap water taken in a beaker, it is observed that the pH of the solution decreases rapidly. This indicates that pH of tap water was around 7 (neutral) and on addition of acid, it decreases rapidly.

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