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Law of Conservation of Matter

Balancing of ...

Question

Balancing of a chemical equation is based on which of the following laws?

A

Law of multiple proportions

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B

Law of constant proportions

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C

Avogadro's law

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D

Law of conservation of mass

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Solution

The correct option is D Law of conservation of mass
Law of conservation of mass states that mass can neither be created nor destroyed.

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Q. Assertion :The balancing of chemical equations is based on law of conservation of mass. Reason: Total mass of reactants is equal to total mass of products.

Q. Balancing of a chemical equation is to verify a law which is :
{A}law of multiple proportion
{B}law of definite proportion
{C}law of conservation of mass
{D}law of conservation of energy

Q. Show that ''Law of conservation of mass is fully justified in a balanced chemical equation''.

Q. We know that balancing of a chemical equation is entirely based on law of conservation of mass. However, the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of mass in a chemical reaction. So, POAC can also act as a technique for balancing a chemical equation. For example, for a reaction:

A B C_{3} \to A B + C_{2}

.
On applying POAC for A, B & C and relating the 3 equations, we get :

\frac{n_{A B C_{3}}}{2} = \frac{n_{A B}}{2} = \frac{n_{C_{2}}}{3}

(n_{x} :

number of moles of X). Thus, the coefficients of

A B C_{3}, A B & C_{2}

in the balanced chemical equation will be 2, 2 & 3 respectively and the balanced chemical equation can be represented as:

2 A B C_{3} \to 2 A B + 3 C_{2}

.
Now, answer the following question: Which of the following relation is correct regarding the numerical coefficients p,q,r in the balanced chemical equation:

p A + q B_{2} \to r A_{2} B_{5}

Q. Balancing of a chemical equation is based on which of the following law?

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