Which of the following corresponds to incorrect matches with respect to their formation?
(A) Dipositive ion `to` 2 electrons in valence shell in neutral atom.
(B) Unipositive ion `to` 7 electrons in valence shell in neutral atom.
(C ) Trinegative ion `to` 3 electrons in valence shell in neutral atom.
(D) Dinegative ion `to` 6 electrons in valence shell in neutral atom.

Options

A. A and B
B. B and C
C. C and D
D. B and D

Explanation

To solve the question, we need to analyze each option to determine whether the matches regarding the formation of ions are correct or incorrect.

### Step-by-Step Solution:

1. **Understanding Ions**:
- A **positive ion** (cation) is formed when an atom loses electrons.
- A **negative ion** (anion) is formed when an atom gains electrons.

2. **Analyzing Option (A)**:
- **Dipositive ion**: This means the ion has a charge of +2, indicating it has lost 2 electrons.
- In a neutral atom, if it loses 2 electrons, it must have had 2 electrons in its valence shell.
- **Conclusion**: This match is **correct**.

3. **Analyzing Option (B)**:
- **Unipositive ion**: This means the ion has a charge of +1, indicating it has lost 1 electron.
- If it has 7 electrons in its valence shell in the neutral atom, it means it originally had 7 electrons and lost 1, leaving it with 6 electrons in the valence shell.
- **Conclusion**: This match is **incorrect** because a unipositive ion should have 1 electron in the valence shell after losing 1 electron.

4. **Analyzing Option (C)**:
- **Trinegative ion**: This means the ion has a charge of -3, indicating it has gained 3 electrons.
- If it has 3 electrons in its valence shell in the neutral atom, it would have originally had 5 electrons (3 gained to complete the octet).
- **Conclusion**: This match is **incorrect** because a trinegative ion should have 5 electrons in the valence shell after gaining 3 electrons.

5. **Analyzing Option (D)**:
- **Dinegative ion**: This means the ion has a charge of -2, indicating it has gained 2 electrons.
- If it has 6 electrons in its valence shell in the neutral atom, it originally had 4 electrons (gaining 2 to complete the octet).
- **Conclusion**: This match is **correct**.

### Final Answer:
The incorrect matches are found in options **(B)** and **(C)**.

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