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

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

EAMCETEAMCET 2009Coordination Compounds

Solution:

$2Al + 2NaOH + 2H_2O \longrightarrow ^{2NaAlO_3}_{Sodium\ \\ meta\ \\ aluminate}+3H_2$
Sodium meta alurninate, thus formed, is soluble in water and changes into the complex $[Al(H_2O)_2(OH)_4]^- $in which coordination number of Al is 6.