Assertion: `2H_2 + O_ 2 to7 2H_2O` is balanced equation.
Reason Formation of water is combination reaction.

Options

A. If both assertion and reason are time and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the equation `2H₂ + O₂ → 2H₂O` is a balanced equation.
- A balanced equation means that the number of atoms of each element is the same on both sides of the equation.

2. **Counting Atoms in the Equation**:
- On the left side (reactants):
- There are 4 hydrogen atoms (from `2H₂`) and 2 oxygen atoms (from `O₂`).
- On the right side (products):
- There are 4 hydrogen atoms (from `2H₂O`) and 2 oxygen atoms (from `2H₂O`).
- Since both sides have the same number of each type of atom, the equation is balanced.

3. **Conclusion on the Assertion**:
- Since the number of atoms is the same on both sides, the assertion is true.

4. **Understanding the Reason**:
- The reason states that the formation of water is a combination reaction.
- A combination reaction is defined as a reaction where two or more reactants combine to form a single product.

5. **Analyzing the Reaction**:
- In this case, `2H₂` and `O₂` are combining to form `2H₂O`, which fits the definition of a combination reaction.

6. **Conclusion on the Reason**:
- The reason is also true because the formation of water from hydrogen and oxygen is indeed a combination reaction.

7. **Evaluating the Relationship Between Assertion and Reason**:
- While both the assertion and reason are true, the reason does not explain why the equation is balanced. The balance of the equation is based on the conservation of mass, not merely the type of reaction.

8. **Final Answer**:
- Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

### Final Conclusion:
- The correct answer is that both the assertion and reason are true, but the reason is not the correct explanation of the assertion.