Q8 of 48 Page 9

Which of the following gives the correct increasing order of acid strength?

The increasing order of acid strength is water < acetic acid < hydrochloride acid. Hydrochloride acid is a mineral acid and ionises completely in water. A solution hydrochloric acid will have a much higher concentration of H+ ions and hence lower the pH level. That’s why it is a strong acid. Acetic acid is an organic acid and ionises only partially in water. That’s why it is a weak acid. Water is almost neutral in nature. In pure water number of positive hydrogen ions is equal to the negative ions.

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Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?

(i) It turns lime water milky.


(ii) It extinguishes a burning splinter.


(iii) It dissolves in a solution of sodium hydroxide.


(iv) It has a pungent odour.