Select the incorrect statements
(I) Almost alll metals combine with oxygen to form metal oxides.
II. All metal oxides are soluble in water.
III. All metal oxides are basic in nature.
IV. Some metal oxides dissolve in water to form alkalis.

Options

A. Only I
B. Only II
C. Both II and III
D. Both II and IV

Explanation

To determine which statements are incorrect, let's analyze each one step by step:

**Step 1: Analyze Statement I**
- Statement: "Almost all metals combine with oxygen to form metal oxides."
- Explanation: This statement is correct. Most metals react with oxygen to form metal oxides. For example, when magnesium reacts with oxygen, it forms magnesium oxide (MgO).

**Step 2: Analyze Statement II**
- Statement: "All metal oxides are soluble in water."
- Explanation: This statement is incorrect. Not all metal oxides are soluble in water. For instance, barium oxide (BaO) is soluble in water, while lead(II) oxide (PbO) is not. The solubility of metal oxides depends on their chemical structure and properties.

**Step 3: Analyze Statement III**
- Statement: "All metal oxides are basic in nature."
- Explanation: This statement is also incorrect. While many metal oxides are basic, some are amphoteric or even acidic. For example, aluminum oxide (Al2O3) is amphoteric, meaning it can react with both acids and bases.

**Step 4: Analyze Statement IV**
- Statement: "Some metal oxides dissolve in water to form alkalis."
- Explanation: This statement is correct. For example, when sodium oxide (Na2O) dissolves in water, it forms sodium hydroxide (NaOH), which is an alkali.

**Conclusion: Identify Incorrect Statements**
- The incorrect statements are II and III. Therefore, the answer is that statements II and III are incorrect.

### Summary of Incorrect Statements:
- Statement II: "All metal oxides are soluble in water." (Incorrect)
- Statement III: "All metal oxides are basic in nature." (Incorrect)