2KBr+I2→2Kl+Br2 reaction is not possible. Reaction of potassium bromide with iodine gives no product, as the activity of halogens decreases down the group. Hence, iodine is less reactive than bromine and thus, it cannot displace bromine from its compounds. KBr+I2→ No reaction Reaction of copper with silver nitrate is possible, as copper is more reactive than silver, so it can displace silver from its salt solution. Cu+2AgNO3→Cu(NO3)2+2Ag Reaction of iron with sulphuric acid is also possible as iron is placed above hydrogen is activity series and thus can displace hydrogen from dilute acid like H2SO4. HCl. Fe+H2SO4→H2+FeSO4 CuO+H2→Cu+H2O; is a redox reaction, that proceeds via electrolysis.