Which of the following salt has an outcome of blue colour as a result of a borax bead test?(a) Nickel sulphate(b) Cobalt sulphate(c) Ferrous sulphate(d) Chromium sulphateThis question was posed to me in an internship interview.I'd like to ask this question from p-Block Elements in section p-Block Elements of Chemistry – Class 11

Which of the following salt has an outcome of blue colour as a result

1.	Which of the following salt has an outcome of blue colour as a result of a borax bead test?(a) Nickel sulphate(b) Cobalt sulphate(c) Ferrous sulphate(d) Chromium sulphateThis question was posed to me in an internship interview.I'd like to ask this question from p-Block Elements in section p-Block Elements of Chemistry – Class 11
Answer» CORRECT option is (b) Cobalt sulphate The best explanation: Cobalt sulphate on heating gives cobalt oxide and SULPHUR trioxide, further cobalt oxide is combined with boric ANHYDRIDE which gives cobalt METABORATE which is a blue coloured Bead, the colours of iron, chromium and Nickel are green, green and BROWN respectively.

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