Q.

Sodium hydrogen carbonate when added to acetic acid evolves a gas.


Which one of the following statements is right about how the gas evolved?


(i) It turns lime water milky


(ii) it extinguishes a burning sphincter


(iii) it dissolves in a solution of sodium hydroxide


(iv) it has a pungent smell.


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a

(i) and (iv)  

b

(i), (ii) and (iii)

c

(i) and (ii)

d

(ii), (iii) and (iv)

answer is B.

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Detailed Solution

detailed_solution_thumbnail
The gas evolved is CO2 gas which has the property of turning lime water milky.
Metal carbonates or bicarbonates when reacted with the acid form of metal salts with the evolution of carbon dioxide gas takes place. Therefore, when sodium hydrogen carbonate is added to acetic acid carbon dioxide gas is evolved.
Na2CO3+2CH3COOH  2CH3COONa+CO2+H2O Carbon dioxide gas turns lime water milky.
 
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