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  4. During the borax bead test with CuSO 4, a blue green colour of the bead was observed in oxidising flame due to the formation of

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Q. During the borax bead test with $CuSO _4$, a blue green colour of the bead was observed in oxidising flame due to the formation of

JEE MainJEE Main 2023The p-Block Elements

Solution:

Blue green colour is due to formation of $Cu \left( BO _2\right)_2$
$ CuSO _4 \xrightarrow{\Delta} CuO + SO _3 $
$CuO + B _2 O _3 \rightarrow Cu \left( BO _2\right)_2$