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Aluminium reacts with NaOH and forms compound ' X '. If the coordination number of aluminium in ' X ' is 6 , the correct formula of X is

Options

  1. A[ Al ( H ₂ O )₄( OH )₂ ]⁺
  2. B[ Al ( H ₂ O )₃( OH )₃ ]
  3. C[ Al ( H ₂ O )₂( OH )₄ ]⁻
  4. D[ Al ( H ₂ O )₆ ]( OH )₃

Correct answer

C. [ Al ( H ₂ O )₂( OH )₄ ]⁻

Step-by-step solution

2 Al +2 NaOH +2 H ₂ O sodium meta aluminate 2 NaAlO ₂ +3 H ₂ Sodium metaaluminate, thus formed, is soluble in water and changes into the complex [ Al ( H ₂ O )₂( OH )₄ ]⁻ , in which coordination number of Al is 6 .

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