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NEET Chemistry QUESTION #7392
Question 1
The pair of amphoteric hydroxides is:
  • Al(OH)₃, LiOH
  • Be(OH)₂, Mg(OH)₂
  • B(OH)₃, Be(OH)₂
  • Be(OH)₂, Zn(OH)₂✔️
Correct Answer Explanation
Amphoteric hydroxides react with both acids and bases:
  • \(\text{Be(OH)}_2\): reacts with HCl (→ BeCl₂) and NaOH (→ Na₂[Be(OH)₄])
  • \(\text{Zn(OH)}_2\): reacts with HCl (→ ZnCl₂) and NaOH (→ Na₂[Zn(OH)₄])
LiOH and Mg(OH)₂ are purely basic. B(OH)₃ is acidic (boric acid). Al(OH)₃ is also amphoteric, but LiOH is not, so option (1) is wrong.