Question

Given below are two statements :
Statement I : The number of pairs among $[Al_2O_3, Cr_2O_3]$, $[Cl_2O_7, Mn_2O_7]$, $[Na_2O, V_2O_3]$ and $[CO, N_2O]$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4.
Statement II : Among $Na_2O, Al_2O_3, CO$ and $Cl_2O_7$, the most basic and acidic oxides are $Na_2O$ and $Cl_2O_7$, respectively.
In the light of the above statements, choose the correct answer from the options given below :

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Oxides are classified based on their reaction with water, acids, and bases into acidic (non-metals/high oxidation state metals), basic (low oxidation state metals), amphoteric (react with both), and neutral (react with neither).
Step 2: Detailed Explanation:
Analysis of Statement I:
1. $[Al_2O_3, Cr_2O_3]$: Both are amphoteric. (Same nature)
2. $[Cl_2O_7, Mn_2O_7]$: Both are strongly acidic ($Mn$ in +7 is non-metallic in character). (Same nature)
3. $[Na_2O, V_2O_3]$: Both are basic ($V$ in +3 oxidation state forms basic oxides). (Same nature)
4. $[CO, N_2O]$: Both are neutral oxides. (Same nature)
Total pairs $= 4$. So, Statement I is True.

Analysis of Statement II:
$Na_2O$ (alkali metal oxide) is strongly basic.
$Al_2O_3$ is amphoteric.
$CO$ is neutral.
$Cl_2O_7$ (non-metal oxide) is strongly acidic.
Thus, $Na_2O$ is the most basic and $Cl_2O_7$ is the most acidic. So, Statement II is True.
Step 3: Final Answer:
Both Statement I and Statement II are true.