Why bar magnets always attract objects made of iron,cobalt and nickel rather than gold,silver?
The figure represents the reactivity of metals then which of the following are correct?
(i) Sodium is more reactive than magnesium.
(ii) Magnesium ad aluminium metals displace lead.
(iii) Magnesium and aluminium metals displace calcium.
(iv) Iron and tin metals can displace magnesium.
(v) Most reactive metal is sodium.
(vi) Gold is least reactive.
(vii) Calcium and zinc metals displace iron.
State one use each of the following non-metals: Copper, Aluminium, Iron, Silver, Gold, Mercury