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COMEDK2024ChemistryClassification of Elements and Periodicity in Properties

Which of the following statements is/are true about the diagonal relationship of Be and Al ? (i) Both react with NaOH to liberate hydrogen. (ii) Their oxides are basic. (iii) They are made passive by nitric acid. (iv) Their carbides give acetylene on treatment with water.

Options

  1. AOnly (i)
  2. B(i) and (iii)
  3. C(ii) and (iv)
  4. D(i), (ii), (iii)

Correct answer

B. (i) and (iii)

Step-by-step solution

Statement given in (i) and (iii) are correct, while in (ii) and (iv) are incorrect. BeO and Al ₂ O ₃ are amphoteric. These react with acid as well as alkalines to given corresponding salts. aligned & BeO +2 HCl BeCl ₂+ H ₂ O & BeO +2 NaOH Na ₂ BeO ₂+ H ₂ O & Al ₂ O ₃+6 HCl 2 AlCl ₃+3 H ₂ O & Al ₂ O ₃+2 NaOH 2 NaAlO ₂+ H ₂ O aligned Be ₂ C and Al ₄ C ₃ give methane on treatment with water. aligned & Be ₂ C +4 H ₂ O 2 Be ( OH )₂+ CH ₄ & Al ₄ C ₃+12 H ₂ O 4 Al ( OH )₃+3 CH ₄ aligned

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