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In the following questions a statement o...

In the following questions a statement of assertion (A) is followed by a statement of reason ( R)
A : `Na_(2) O` is more basic than `AI_(2) O_(3)` .
R : Sodium is less electropositive than aluminium.

A

If Both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1) .

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statements then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the given assertion and reason, we will break it down step by step: ### Step 1: Understand the Assertion The assertion states that Na₂O (sodium oxide) is more basic than Al₂O₃ (aluminum oxide). - **Basicity of Metal Oxides**: Metal oxides are generally classified based on their ability to donate electrons. Sodium oxide (Na₂O) is formed from sodium, an alkali metal, which tends to lose its outermost electron easily, making Na₂O a strong base. ### Step 2: Analyze the Basicity of Na₂O and Al₂O₃ - **Sodium Oxide (Na₂O)**: As an alkali metal oxide, Na₂O readily reacts with acids to form salts and water, indicating its strong basic nature. - **Aluminum Oxide (Al₂O₃)**: Aluminum oxide is amphoteric, meaning it can react with both acids and bases, but it does not exhibit the same level of basicity as Na₂O. ### Step 3: Understand the Reason The reason states that sodium is less electropositive than aluminum. - **Electropositivity**: Electropositivity refers to the ability of an atom to lose electrons and form a positive ion. Generally, alkali metals like sodium are more electropositive than aluminum, meaning sodium can lose its electron more readily than aluminum. ### Step 4: Compare the Assertion and Reason - The assertion is true: Na₂O is indeed more basic than Al₂O₃. - The reason is false: Sodium is actually more electropositive than aluminum, not less. ### Conclusion - **Assertion (A)**: True - **Reason (R)**: False Thus, the correct conclusion is that the assertion is true, but the reason provided is false. ---
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