A metal having a negative reduction potential when dipped in the solution of its ions has a tendency to

pass into solution

The correct answer is option 1. pass into solution.

To determine the behavior of a metal with a negative reduction potential when it is dipped into a solution of its ions, let us first understand what a negative reduction potential means:

A negative reduction potential indicates that the metal has a lower tendency to gain electrons (i.e., to be reduced) compared to the hydrogen ion reduction, which is set as the reference (0 V). This implies that the metal is more likely to lose electrons and oxidize, rather than gain electrons and reduce.

Given this, let us analyze the options:

1. Pass into solution: This implies that the metal is likely to dissolve into the solution as its ions. Given a negative reduction potential, the metal tends to lose electrons and oxidize, forming positive metal ions (\(M \rightarrow M^{n+} + ne^-\)). Therefore, it will tend to pass into the solution.

2. To be deposited from the solution: This implies that the metal ions in the solution would gain electrons and deposit as solid metal. However, since the metal has a negative reduction potential, it is less likely to gain electrons and deposit from the solution.

3. To become electrically positive: This would mean that the metal tends to lose electrons and form positive ions. This aligns with having a negative reduction potential, as such metals tend to oxidize and form cations.

4. To remain neutral: This would imply no reaction occurs, which is inconsistent with the property of a metal having a negative reduction potential that indicates a tendency to oxidize.

Conclusion: A metal with a negative reduction potential, when dipped in the solution of its ions, has a tendency to pass into solution. This is because the metal will tend to lose electrons and form positive ions, thereby dissolving into the solution.