1.

Which of the following pairs of cations will turn borax beads blue in an oxidising flame?

Answer»

`Fe^(2+)` and `Co^(2+)`
`Co^(2+)` and `CU^(2+)`
`Cu^(2+)` and `MN^(2+)`
`Cu^(2+)` and `Cr^(3+)`

SOLUTION :`Fe^(2+), Co^(+2)`


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