Question

Assertion:- the number of atoms of each element remains the same , before and after a chemical reaction .


Reason :- any chemical equation can be unbalanced because the mass may not be same on both sides of the equation. al

answere me guys plsit is important​

Answer 1

Answer:

both a and r are true but r is not the correct expl of a

Explanation:

assertioan ( this is right becoz of law of conservation of mass)

reason ( this is right becoz it's in the textbook

hope it helps all best for 2022 boards mcq kyu

Answer 2

Assertion is true but reason is false.

Explanation:

• According to the law of conservation of matter:

The number of atoms before and after a chemical reaction should be equal, such that no atoms are, under normal circumstances, created or destroyed.

When a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.

• Unbalanced equation defies law of mass conservation.

• Unbalance equation implies that matter is created/destroyed which is impossible. Hence an unbalanced equation is considered incorrect.

• Chemical reactions must be balanced, or in other words, must have the same number of various atoms in the products as in the reactants.

• If a chemical reaction is not balanced, no information about the relationship between products and reactants can be derived.