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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The pair of amphoteric hydroxides is:
  • A
    Al(OH)3​, LiOH
  • B
    Be(OH)2​, Mg(OH)2​
  • C
    B(OH)3​​, Be(OH)2​
  • D
    Be(OH)2​, Zn(OH)2​
✓

Answer

  1. Be(OH)2​, Zn(OH)2​

Explanation:

The pair of amphoteric hydroxides is Be(OH)2​, Zn(OH)2​​.

Amphoteric oxides reacts with acids as well as bases.

Beryllium hydroxide is amphoteric in nature due to small size, high electronegativity and high ionisation energy of beryllium.

Be(OH)2​ + 2HCl → BeCl2​ + 2H2​​O

Be(OH)2​​ + 2NaOH → Na2​​BeO2​​ + 2H2​​O

The amphoteric behaviour of zinc hydroxide is as shown.

Zn(OH)2​​ + 2HCl → ZnCl2​​ + 2H2​O

Zn(OH)2​ + 2NaOH → Na2​​ZnO2​​​ + H2​​O

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