Assertion : Positive ions will be wider than parent atoms.
Reason : Nuclear charge pulls them closer.

Options

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

Explanation

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

### Step 1: Analyze the Assertion
The assertion states: "Positive ions will be wider than parent atoms."

- Positive ions are formed when an atom loses one or more electrons. This loss of electrons reduces the electron-electron repulsion in the electron cloud, allowing the remaining electrons to be pulled closer to the nucleus due to the increased effective nuclear charge (the net positive charge experienced by electrons).
- As a result, positive ions are actually smaller than their parent atoms, not wider.

### Step 2: Analyze the Reason
The reason states: "Nuclear charge pulls them closer."

- The nuclear charge is the total charge of the nucleus, which is due to the protons. When an atom loses electrons to form a positive ion, the remaining electrons experience a stronger attraction to the nucleus because there are fewer electrons to repel each other.
- This increased attraction causes the electrons to be pulled closer to the nucleus, leading to a decrease in the size of the ion compared to the parent atom.

### Step 3: Conclusion
- Since the assertion is false (positive ions are smaller, not wider than parent atoms) and the reason is also false (the nuclear charge does pull electrons closer, but this does not support the assertion), we conclude that both the assertion and the reason are incorrect.

### Final Answer
- Assertion: False
- Reason: False