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Which of the following pairs of cations ...

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

A

`Fe^(2+)` and `Co^(2+)`

B

`Co^(2+)` and `Cu^(2+)`

C

`Cu^(2+)` and `Mn^(2+)`

D

`Cu^(2+)` and `Cr^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Fe^(2+), Co^(+2)`
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