1 .	The rusting of iron nail
[ A ]    decreases its weight [ B ]    increases its weight [ C ]    does not affect weight but iron is oxidised [ D ]    does not affect weight but iron is reduced
Answer : Option B Explanation : The rusting of iron nail takes place in the presence of air (oxygen) and water (moisture). It increases the weight of iron nail due to the formation of rust. 4Fe + $3O_2$ 2+ x$H_2O$ → $2Fe_2O_2$, x$H_2O$
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