AP EAMCET2009Chemistryp Block Elements (Group 13 & 14)
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
- A[ Al ( H ₂ O )₄( OH )₂ ]⁺
- B[ Al ( H ₂ O )₃( OH )₃ ]
- C[ Al ( H ₂ O )₂( OH )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 .