Q9 of 48 Page 9

If a few drops of concentrated acid accidentally spill over the hand of a student, what should be done?

Wash the hand immediately with plenty of water as it helps to wash away most of the acid. Thereafter apply a paste of baking soda (NaHCO3) to neutralise the little acid if any, left over the hand. Baking soda has weak basic properties that is used to neutralise the acid. Here, a strong base cannot be used to neutralise the acid as it can corrode the skin.

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7

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

 8

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

 10

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.

 11

Common salt besides being used in kitchen can also be used as the raw material for making

(i) Washing soda


(ii) bleaching soda


(iii) Baking soda


(iv) slaked lime