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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.

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. CBSE 2022 Term 1 Science Class 10 Question Paper Solved.

(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.

  1. (i) and (ii)
  2. (i) and (iii)
  3. (iii) and (iv)
  4. (ii) and (iv)

Acids Bases Salts

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Answer

(iii) and (iv)

Reason — The pH of tap water was around 7.0 because tap water is a neutral solution. On addition of acid to water the heat energy is released hence the reaction is exothermic. The pH of the solution decreases rapidly from 3 to 1 with the addition of acid.

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