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Assertion (A) : Following is a balanced chemical equation for the action of steam on iron : 3Fe + 4H2O → Fe3O4 + 4H2
Reason (R): The law of conservation of mass holds good for a chemical equation.
Asked by Aditya Kumar Srivastava Last Modified
Answer 
The correct option is A
Both (A) and (R) are true and (R) is the correct explanation of the assertion (A).
Here the number of moles of atoms on both sides (reactant and product) is the same.
Therefore, the chemical equation is balanced.
Thus the assertion is true.
Law of conservation of mass states that mass can neither be created nor be destroyed, it can only be transformed from one form to another in a chemical reaction.
Here in the reaction, the number of moles of atoms on both sides (reactant and product) is the same.
Thus the reason is also true and is the correct explanation for the assertion.
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Dr Nandhini J V R
Dentist with tutoring experience of 10 years for Class 6-12 CBSE and State board students
Both (A) and (R) are true and (R) is the correct explanation of the assertion.
Explanation for assertion:-
When iron reacts with steam the products that are formed are Iron (II, III) oxide and hydrogen gas.Here the number of moles of atoms on both sides (reactant and product) is the same.Therefore, the chemical equation is balanced.Thus the assertion is true.
Explanation for reason:-
Law of conservation of mass states that mass can neither be created nor be destroyed, it can only be transformed from one form to another in a chemical reaction.Thus for a chemical equation to obey the law of conservation of mass, it has to be balanced.Here in the reaction, the number of moles of atoms on both sides (reactant and product) is the same.
Therefore, the mass of the reactants is the same as the mass of the products.
Thus law of conservation of mass holds good for a chemical equation.
Thus the reason is also true and is the correct explanation for the assertion.
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Both assertion(A) and reason(R) are correct and assertion is the correct explanation for reason.
Iron metal(Reactive Metal)displaces hydrogen from water leading to the formation of iron(III) oxide(solid precipitates) and the liberation of hydrogen gas, the reaction takes place for a long duration.
The formation of iron oxide from iron and water is called the rusting of iron.
The brown color layer that forms on the iron is iron oxide.
The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed holds true for this equation.
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Explanation for assertion:-
When iron reacts with steam the products that are formed are Iron (II, III) oxide and hydrogen gas.
The complete reaction
Here the number of moles of atoms on both sides (reactant and product) is the same.
Therefore, the chemical equation is balanced.
Thus the assertion is true.
Explanation for reason:-
Law of conservation of mass states that mass can neither be created nor be destroyed, it can only be transformed from one form to another in a chemical reaction.
Thus for a chemical equation to obey the law of conservation of mass, it has to be balanced.
Here in the reaction, the number of moles of atoms on both sides (reactant and product) is th
e same.
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