Question

Which of the following statements is correct about the reaction given below:
4Fe(s) + 3O2(g) → 2Fe2O3(g)
(i) Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows law of conservation of mass.
(ii) Total mass of reactants = total mass of product; therefore, law of multiple proportions is followed.
(iii) Amount of Fe2O3 can be increased by taking any one of the reactants (iron or oxygen) in excess.
(iv) Amount of Fe2O3 produced will decrease if the amount of any one of the reactants (iron or oxygen) is taken in excess.

Answer 1

(i) Total mass of iron and oxygen in reactants=total mass of iron and oxygen in product therefore it follows law of conversation of mass.

Answer 2

Answer:(i)

Explanation: In option (i), total mass of reactants is always equal to the mass of products in all reactions excluding nuclear reactions.This is following the law of conservation of mass.

In option (ii), Iron shows valency of +2 and +3 i.e it can form two oxides with oxygen following the law of multiple proportion which says when two elements combine to form more than one compound, one of the element bear a simple whole number ration keeping mass of one element fixed.

and this law has no relation with the law of conservation of mass

Option (iii) and (iv), amount of product can not be increased by taking any of the product in excess since the other will be limiting and will finish leaving one of the reactant in excess.