Q12 of 48 Page 9

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

Baking powder is a mixture of baking soda NaHCO3 (sodium hydrogen carbonate) and a mild edible acid such as tartaric acid. When baking powder is mixed with water, sodium hydrogen carbonate reacts with tartaric acid and accepts hydrogen ions from it. This process releases carbon dioxide gas which is trapped in the dough when baking powder is used to make bread and cake. The trapping the carbon dioxide makes the dough rise and hence the bread is soft and fluffy.

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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

 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