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NEET2019Chemistrys Block ElementsActual

Which of the following are formula of methanides? (1) Be ₂ C (2) CaC ₂ (3) Mg ₂ C ₃ (4) Al ₄ C ₃

Options

  1. AOnly 1 and 4
  2. BOnly 1 and 2
  3. COnly 3 and 4
  4. DOnly 2 and 4

Correct answer

A. Only 1 and 4

Step-by-step solution

Methanides are carbides which on hydrolysis give methane. aligned & Be ₂ C +4 H ₂ O 2 Be ( OH )₂+ CH ₄ & CaC ₂+2 H ₂ O Ca ( OH )₂+ C ₂ H ₂ & Mg ₂ C ₃+4 H ₂ O 2 Mg ( OH )₂+ C ₃ H ₄ & Al ₄ C ₃+12 H ₂ O 4 Al ( OH )₃+3 CH ₄ aligned

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