A bromide ion does not interfere with the chromyl chloride test, because when a bromide is present :

B r_{2}

is liberated, which leaves the

N a O H

solution colourless

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C r O_{2} B r_{2}

formed, does not volatilise as

C r O_{2} C l_{2}

does

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C r O_{2} B r_{2}

does not react with

N a O H

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no gaseous substance containing bromine is produced

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Solution

The correct option is A $B r_{2}$ is liberated, which leaves the $N a O H$ solution colourless
The chromyl chloride test entails heating a sample suspected of containing chloride with potassium dichromate and concentrated sulfuric acid. If chloride is present, chromyl chloride is formed and red fumes of $C r O_{2} C l_{2}$ are evident.

If there is no chloride present, no red fumes are produced. No analogous compounds are formed with fluorides, bromides, iodides and cyanides, so this test is therefore specific for chlorides.

Option A is correct.

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