Option 1 states that both Statement I and Statement II are true, and further claims that Statement II is the correct explanation of Statement I.

Statement I asserts that metal ions are Lewis acids, while Statement II states that metal ions are electron pair acceptors.

A Lewis acid is a substance that can accept an electron pair to form a chemical bond. In this case, metal ions are capable of accepting electron pairs, making them Lewis acids.

However, the statement that metal ions are electron pair acceptors is not a complete explanation for why metal ions are Lewis acids. While electron pair acceptance is one characteristic of Lewis acids, it is not the only defining factor. Lewis acids can also accept other electron-deficient species, such as lone pairs or positive charges.

Therefore, Option 2 correctly identifies that both statements are individually true, but Statement II is not the complete or correct explanation of Statement I.

In summary, metal ions are Lewis acids because they can accept electron pairs, but this does not fully explain why all metal ions are Lewis acids.