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  4. Aluminium reacts with caustic soda to form:

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Q. Aluminium reacts with caustic soda to form:

VMMC MedicalVMMC Medical 2006

Solution:

Aluminium reacts with caustic soda to form sodium meta aluminate. $ 2Al+2NaOH+2{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} \text{Sodium} \\ \text{metaluminate} \end{smallmatrix}}{\mathop{2NaAl{{O}_{2}}}}\,+3{{H}_{2}}\uparrow $