JEE Chemistry 2025 Question with Solution

Given: Two statements about the nature of oxides formed by elements at the extreme left and extreme right of the periodic table.

Find: Which statement is true or false and hence identify the correct option.

Elements on the extreme left of the periodic table are generally metals such as alkali metals and alkaline earth metals. These metals usually form basic oxides, not acidic oxides. Therefore, Statement (I) is false.

Elements on the extreme right of the periodic table are generally non-metals. Non-metal oxides are usually acidic oxides and can react with water to form acids. For example:

$$\text{SO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{SO}_3$$

and

$$\text{CO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{CO}_3$$

So, Statement (II) is true.

Therefore, the correct option is C.

Given:

1. Statement (I): An element in the extreme left of the periodic table forms acidic oxides.
2. Statement (II): Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.

Find: The correct truth values of the two statements.

For Statement (I), the extreme left side of the periodic table contains highly electropositive metallic elements. Their oxides are generally basic in nature. Hence the claim that they form acidic oxides is incorrect.

For Statement (II), the extreme right side of the periodic table contains non-metals. Their oxides are generally acidic and react with water to give acids. Example:

$$\text{SO}_2 + \text{H}_2\text{O} \rightarrow \text{H}_2\text{SO}_3$$

Thus, this statement is correct.

Hence, Statement (I) is false but Statement (II) is true, so the correct option is C.