Assertion : `CO_(2)` is non - polar while `H_(2)O` is polar, though both are triatomic.
Reason : `CO_(2)` is linear while `H_(2)O` is angular.

Options

A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement.

Answer

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

### Step 1: Understanding the Assertion
The assertion states that CO₂ is non-polar while H₂O is polar, despite both being triatomic molecules.

- **CO₂ (Carbon Dioxide)**: The molecular structure of CO₂ is linear. The carbon atom is in the center with two oxygen atoms on either side. The dipole moments of the two C=O bonds are equal in magnitude but opposite in direction, which leads to a net dipole moment of zero. Therefore, CO₂ is considered non-polar.

- **H₂O (Water)**: The molecular structure of H₂O is bent or angular due to the presence of two lone pairs of electrons on the oxygen atom. The dipole moments of the O-H bonds do not cancel out because of the bent shape, resulting in a net dipole moment. Thus, H₂O is polar.

### Step 2: Understanding the Reason
The reason states that CO₂ is linear while H₂O is angular.

- **CO₂**: The linear shape of CO₂ is due to the arrangement of the atoms and the absence of lone pairs on the central carbon atom. This linearity allows the dipole moments to cancel each other out.

- **H₂O**: The angular shape of H₂O is due to the two lone pairs of electrons on the oxygen atom. These lone pairs repel the bonded hydrogen atoms, causing the molecule to adopt a bent shape, which prevents the dipole moments from canceling out.

### Step 3: Conclusion
Both the assertion and the reason are correct. CO₂ is indeed non-polar and H₂O is polar, and the reason provided (the shapes of the molecules) correctly explains why this is the case.

### Final Answer
Both the assertion and reason are correct, and the reason is a correct explanation of the assertion.