Few statements regarding the properties of bases are given below. Mark the correct statements :
(i) Sodium hydroxide and potassium hydroxide are soluble in water.
(ii) Calcium hydroxide and magnesium hydroxide are partially soluble in water.
(iii) All metallic hydroxides react with acids to form their respective metallic salts.
(iv) Metallic oxides are acidic oxides hence they react with acids to form salts.

Options

A. (i), (ii) and (iv) only
B. (i), (iii) and (iv) only
C. (i), (ii) and (iii) only
D. (ii) and (iii) only

Explanation

To determine which statements regarding the properties of bases are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): Sodium hydroxide and potassium hydroxide are soluble in water.**
- Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are both highly soluble in water. When they dissolve, they dissociate into their respective ions, making them strong bases. Therefore, this statement is **correct**.

2. **Statement (ii): Calcium hydroxide and magnesium hydroxide are partially soluble in water.**
- Calcium hydroxide (Ca(OH)₂) is moderately soluble in water, while magnesium hydroxide (Mg(OH)₂) has very low solubility. Hence, both are considered partially soluble in water. Therefore, this statement is **correct**.

3. **Statement (iii): All metallic hydroxides react with acids to form their respective metallic salts.**
- Metallic hydroxides do react with acids to form salts and water. For example, when zinc hydroxide (Zn(OH)₂) reacts with hydrochloric acid (HCl), it produces zinc chloride (ZnCl₂) and water. Therefore, this statement is **correct**.

4. **Statement (iv): Metallic oxides are acidic oxides hence they react with acids to form salts.**
- This statement is incorrect. Metallic oxides are generally basic in nature, not acidic. They react with acids to form salts and water. For example, when zinc oxide (ZnO) reacts with hydrochloric acid (HCl), it produces zinc chloride (ZnCl₂) and water. Therefore, this statement is **incorrect**.

### Conclusion:
The correct statements are:
- Statement (i): Correct
- Statement (ii): Correct
- Statement (iii): Correct
- Statement (iv): Incorrect

Thus, the correct options are **1, 2, and 3**.