Name one non-metal and one metal, which are in liquid state at room temperature.

1 a) Due to which property of metals are metallic foils prepared?
b) Write uses of aluminium foils? 3 Give reasons for the following
i) Zinc oxide is considered an amphoteric oxide.
ii) Non-metals in general do not displace hydrogen from dilute acids.
iii) Metals conduct electricity. 4 Identify the following oxides with neutral, acidic, basic and amphoteric oxides.
i) Al₂O₃  ii) MgO  iii) SO₂  iv) CO;  v) Na₂O  vi) N₂O  vii) ZnO  viii) CO₂  ix) SO₃ x) CaO. 5 By what processes do you concentrate the following ores:
i) PbS(galena)
ii) Fe₂O₃(haematite)
iii) Al₂O₃.2H₂O (bauxite).