The set in which compounds have different nature is:
Classification of Elements & Periodicity · Class 11 · JEE Main Previous Year Question
The set in which compounds have different nature is:
- a
and
- b✓
and
- c
and
- d
and
and
🧠 The question wants the pair that DIFFERS in nature — find one acidic + one basic, or one amphoteric + one not Each option lists two compounds. You need to know each compound's nature, then spot the pair that is mismatched.
🗺️ Classify each compound : boric acid — Lewis acid, acidic. : phosphorous acid (diprotic) — acidic. : classic amphoteric hydroxide. : strong base. : strong base. : amphoteric (Be is at the diagonal boundary).
Now scan the options: (a) acidic + acidic → same nature. (b) acidic + amphoteric → different nature. ✓ (c) basic + basic → same. (d) amphoteric + amphoteric → same.
⚠️ The trap Many students mark (d) thinking Be(OH)₂ is "just another Group 2 hydroxide" and so basic. But Be is the exception in Group 2 — its hydroxide is amphoteric, just like Al(OH)₃. Both behave the same way. The real "different pair" is (b).
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