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P Block Elements question

2019 · 9 Apr · Shift 2 · Q12
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P Block Elements question

2019 · 9 Apr · Shift 2 · Q12

JEE MainChemistryP Block ElementsMCQ+4 / −1
The correct statements among I to III regarding group 13 element oxides are, (I) Boron trioxide is acidic. (II) Oxides of aluminium and gallium are amphoteric. (III) Oxides of indium and thalliumare basic.
  1. A
    (II) and (III) only
  2. B
    (I), (II) and (III)
  3. C
    (I) and (III) only
  4. D
    (I) and (II) only
View written solutionFree

Correct answer: B

  1. Trend in the acidic/basic nature of group 13 oxides

    Down group 13, the metallic character increases.

    • Non-metallic oxides are generally acidic.
    • Oxides of elements with intermediate character are often amphoteric.
    • More metallic oxides are generally basic.

  2. Check statement (I): Boron trioxide is acidic

    Boron is a non-metal, so its oxide B2O3\mathrm{B_2O_3}B2​O3​ is acidic.

    It reacts with bases to form borates, so statement (I) is correct.

  3. Check statement (II): Oxides of aluminium and gallium are amphoteric

    • Al2O3\mathrm{Al_2O_3}Al2​O3​ is a well-known amphoteric oxide.
    • Ga2O3\mathrm{Ga_2O_3}Ga2​O3​ is also amphoteric.

    Hence statement (II) is correct.

  4. Check statement (III): Oxides of indium and thallium are basic

    Moving further down the group, metallic character increases.

    • Indium oxide In2O3\mathrm{In_2O_3}In2​O3​ is predominantly basic.
    • Thallium oxide is also basic.

    Therefore statement (III) is correct.

  5. Conclusion

    All three statements (I), (II), and (III) are correct.

    Therefore, the correct option is: B\boxed{\text{B}}B​

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