Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H₂SO₄ followed by treatment with NaOH ?

(A) HOCI + H₂O₂ → H₃O⁺ + Cl^- + O₂

(B) I₂ + H₂O₂ + 2OH^- → 2I^- + 2H₂O + O₂

Choose the correct option.

Given below are two statements :

Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Which of the following ore is concentrated using group 1 cyanide salt ?