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Q.

2 % of ethyl alcohol is added during storage of chloroform. This is because

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a

it removes the phosgene, if formed into harmless ethyl hydrogen sulphate

b

it remove, the phosgene ,if formed into harmless diethyl carbonate

c

it removes, HCl formed during oxidation of chloroform into phosgene

d

all the above

answer is B.

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Detailed Solution

The substance which when added to a chemical reaction decrease the rate of reaction is called negative catalyst. In CHCl3​
 when two percent ethanol is added , it stops the formation of carbonyl chloride. So ethanol acts as negative catalyst and hence added to chloroform. 

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