• Metal- A has no reaction with dil. HCI or H2SO4, it forms a black oxide, B, which reacts with hot. Dilute H2SO4 to give a blue solution, C, Metal A also forms a green compound, D, Which reacts with dil. HNO3, to give colourless gas E, and another blue solution F, the colourless gas, E turns lime water milky.
• State the names of A, B, C, D, E and F.
