Question:
Which of the following is the correct increasing order of atomic number of elements A, B and C of third period, if their oxides are amphoteric, basic and acidic in nature respectively?
Which of the following is the correct increasing order of atomic number of elements A, B and C of third period, if their oxides are amphoteric, basic and acidic in nature respectively?
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Left to right in a period: Basic $\rightarrow$ Amphoteric $\rightarrow$ Acidic.
Updated On: Jun 6, 2026
- B < A < C
- A < B < C
- C < A < B
- B < C < A
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Periodic trends in oxide acidity/basicity.
Step 2: Meaning
Oxides become more acidic from left to right in a period.
Step 3: Analysis
3rd period oxides: $Na_2O$ (Basic, B), $Al_2O_3$ (Amphoteric, A), $P_4O_{10}$ (Acidic, C). Basic (B) < Amphoteric (A) < Acidic (C). Atomic numbers: $Na(11) < Al(13) < P(15)$. Order: B < A < C.
Step 4: Conclusion
The order is B < A < C.
Final Answer: (A)
Periodic trends in oxide acidity/basicity.
Step 2: Meaning
Oxides become more acidic from left to right in a period.
Step 3: Analysis
3rd period oxides: $Na_2O$ (Basic, B), $Al_2O_3$ (Amphoteric, A), $P_4O_{10}$ (Acidic, C). Basic (B) < Amphoteric (A) < Acidic (C). Atomic numbers: $Na(11) < Al(13) < P(15)$. Order: B < A < C.
Step 4: Conclusion
The order is B < A < C.
Final Answer: (A)
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