Neco 2023 Chemistry Question 3

A student is given a white solid sample suspected to be a transition‑metal chloride. The following procedures are carried out: (i) 0.50 g of the solid is dissolved in 25.0 cm³ of distilled water and the conductivity of the resulting solution is measured. (ii) A small amount of the solid is placed in a test tube, a few drops of concentrated HCl are added and the colour change is observed. (iii) A small quantity of the solid is subjected to a magnetic test using a suspended bar magnet. The conductivity reading obtained in step (i) is 120 µS·cm⁻¹, the addition of HCl produces a deep‑green solution and the solid is attracted to the magnet. Using this information, answer the questions below.