Question

which of the following yields blue-beads in borax test?
options:
a) Co^+2
b) Ni^+2
c) Cd^+2
d) Cr^+2
please give a reason supporting the answer.

Answer 1

a.cobalt. will ...be the answer

Answer 2

Hii buddy,

● Answer -

(a) Co^+2

● Borax bead test -

• Borax bead test is used for detection of transition metals.
• Borax when heated with salts of transition metals, yields salt of certain colours.
• When borax is heated with cobalt sulphate, a blue salt of cobalt metaborate is formed.

Na2B4O7 ---> 2NaBO2 + B2O3

CoSO4 ---> CoO + SO3

CoO + B2O3 ---> Co(BO2)2

Hope this helped you.