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Which of the following transition metals...

Which of the following transition metals yields a green colored bead in the borax bead test?

A

`Ni`

B

`Mn`

C

`Cr`

D

`Cu`

Text Solution

Verified by Experts

The correct Answer is:
C
`Cr_(2)O_(3)+3B_(2)O_(3) overset(Delta)rarr underset((Green))underset("Chromimum metaborate")(2Cr(BO_(2))_(3))`
`NiO + B_(2)O_(3) overset(Delta)rarrunderset("Brown")(Ni (BO_(2))_(2))`
`MnO + B_(2)O_(3) overset(Delta)rarr underset("Pink violet")(Mn(BO_(2))_(2))`
`CuO + B_(2)O_(3) overset(Delta)rarrunderset("Dark blue")(Cu(BO_(2))_(2))`
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