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A white solid imparts a violet colour to...

A white solid imparts a violet colour to a Bunsen flame. On being heated with concentrated `H_(2)SO_(4)`, the solid gives violet vapours that turns starch paper blue. The salt may be:

A

KI

B

NaI

C

`MgI_(2)`

D

`CaBr_(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`K to` violet colour in flame test
`2I^(-) + conc. H_(2)SO_(4) to HI + SO_(4)^(2-) , HI+ H_(2)SO_(4) to I_(2) +H_(2)O+SO_(2)`
`I_(2) + "starch" to " blue colour"`
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