Question

It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect?

  (a) The total mass of the elements present in the reactants is equal to the total mass of the elements present in the products. 

(b) The number of atoms of each element remains the same, before and after a chemical reaction. 

(c) The chemical composition of the reactants is the same before and after the reaction

  (d) Mass can neither be created nor can it be destroyed in a chemical Reaction.​

Answer 1

Answer:

C is the correct option.

Explanation:

As, it is not important that the reactants will be same after the reaction. The chemical composition of the reactants also change.

Answer 2

It is important to balance the chemical equations to satisfy the law of conservation of mass. the law which is incorrect is The chemical composition of the reactants is the same before and after the reaction

• the law of conservation states that in a chemical reaction, mass can neither be created nor can be destroyed.
• also,the The total mass of the elements present in the reactants is equal to the total mass of the elements present in the products. so reactant = product.
• in order to balance, the equation the law of conservation of mass is obeyed.

hence, the correct answer is (c) The chemical composition of the reactants is the same before and after the reaction