CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 48 of 60

Marks: +1, -0

50.0 {\mL}

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

50 {\ml}

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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