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Clean iron fillings were weighed and then place on a watch glass containing water as shown.
i).State the observation made on the iron
ii).With a reason compare the mass of iron fillings at the start of the experiment with that of the product after three days.
iii).Give general chemical formula of the product formed in this experiment.

Answer Text:
i).Iron fillings turns to brown
ii).Mass increases due to the reaction of iron with water and oxygen forming hydrated iron (III) oxide.
iii)#Fe_2O_3.xH_2O# where x = 2, or 3.