This section contains Assertion and Reason type questions .Each question has 4 choices (1)(2)(3) and (4) out of which only one is correct
Assertion(A): A balanced chemical equation has the same number of atoms of each element on both sides of the equation
Reason:According to law of conservation of mass it states that matter can neither be created nor destroyed

Answer

To solve the assertion and reason type question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that "A balanced chemical equation has the same number of atoms of each element on both sides of the equation."
- This is true because, in a balanced chemical equation, the number of atoms of each element is conserved. For example, in the reaction of hydrogen and oxygen to form water (2H₂ + O₂ → 2H₂O), there are 4 hydrogen atoms and 2 oxygen atoms on both sides of the equation.

2. **Understanding the Reason (R)**:
- The reason states that "According to the law of conservation of mass, it states that matter can neither be created nor destroyed."
- This is also true. The law of conservation of mass implies that the total mass of reactants must equal the total mass of products in a chemical reaction. Therefore, the number of atoms must remain constant, leading to the necessity of balancing chemical equations.

3. **Connecting Assertion and Reason**:
- Since both the assertion and the reason are true, and the reason correctly explains why the assertion is true, we can conclude that the assertion is supported by the reason.

4. **Choosing the Correct Option**:
- In assertion-reason questions, the correct choice would typically be that both A and R are true, and R is the correct explanation for A.

### Conclusion:
Thus, the correct answer is that both the assertion and the reason are true, and the reason is the correct explanation for the assertion.