Select the non-metals amongst the following 
i) Bismuth   ii) Sulphur   iii) Arsenic   iv) Hydrogen.

12 Name an ore of zinc other than zinc oxide. By what process can this ore be converted to zinc oxide. 13 What property of hydrogen is observed in the following experiments?
i) Balloon, filled with hydrogen, floats.
ii) Pop sound is heard when a burning splint is introduced at the mouth of hydrogen filled jar.
iii) When black cupric oxide is heated in a stream of hydrogen, reddish colour is obtained. 15 How do you test ammonia gas? 16 Write chemical equations for reactions taking place when
i) Cinnabar is heated in air.
ii) Concentrated sulphuric acid and sulphur are heated together. Calcium metal reacts with water.