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(A) Chloroform $(CHCl_3)$ is oxidized by air in the presence of light to form a highly poisonous gas called phosgene $(COCl_2)$.$2CHCl_3 + O_2 \xright

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$AgNO_3$ solution

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(A) Chloroform $(CHCl_3)$ is oxidized by air in the presence of light to form a highly poisonous gas called phosgene $(COCl_2)$.$2CHCl_3 + O_2 \xrightarrow{light} 2COCl_2 + 2HCl$To detect the presence of phosgene,the sample is tested with $AgNO_3$ solution. If phosgene is present,it reacts with $AgNO_3$ to form a white precipitate of $AgCl$.$COCl_2 + 2AgNO_3 + H_2O \rightarrow 2AgCl(s) + CO_2 + 2HNO_3$Therefore,$AgNO_3$ solution is used to test the purity of chloroform.

Before using chloroform as an anesthetic,its sample is tested by ........

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