Account for the following by writing balanced chemical equations a)Colour of Copper Sulphate changes when an iron nail is dipped in b) Brown coloured copper powder on heating in air turns into black substance ( Need fast)
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a) It's colour changes as cuso4 changes as iron is more reactive as compared to cuso4 so it displaces copper from cuso4 and forms feso4 cuso4+fe⇒feso4 +cu
b) copperpowder turns into black as it gets oxidised in the presence of heat and sufficient air(oxygen) 2cu+o2⇒2cuo
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