A) aluminium hydroxide
B) aluminium oxide
C) sodium metaaluminate
D) sodium tetraaluminate
Correct Answer: C
Solution :
Aluminium reacts with caustic soda to form sodium metaaluminate. \[2Al+2NaOH+2{{H}_{2}}O\xrightarrow{{}}\] \[\underset{\begin{smallmatrix} sodium \\ metaaluminate \end{smallmatrix}}{\mathop{2NaAl{{O}_{2}}}}\,+3{{H}_{2}}\uparrow \]
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