Q15 of 48 Page 9

The pH of the gastric juices released during digestion is

When we eat, our stomach releases hydrochloric acid that helps in digestion. Acids always have pH less than 7. The pH of stomach varies between 1 and 5. The pH of the stomach and the acid present in the stomach need not necessarily be the same.

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13

To protect tooth decay we are advised to brush our teeth regularly. The nature of toothpaste commonly used is

 14

Which of the following statements is correct about an aqueous solution of an acid and a base?

(i) Higher the pH, stronger the acid


(ii) Higher the pH, weaker the acid


(iii) Lower the pH, stronger the base


(iv) Lower the pH, weaker the base

 16

Which of the following phenomena occur when a small amount of acid is added to water?

(i) Ionisation (ii) Neutralisation


(iii) Dilution (iv) Formation

 17

Which one of the following can be used as an acid-base indicator by a visually impaired student?