A) washing soda is expensive
B) washing soda is easily decomposed
C) washing soda reacts with Al to form insoluble aluminium oxide
D) washing soda reacts with Al to form soluble aluminate
Correct Answer: D
Solution :
Washing soda\[(N{{a}_{2}}C{{O}_{3}})\]reacts with Al to form soluble aluminate as follows: \[2Al+\underset{\begin{smallmatrix} Whashing \\ soda \end{smallmatrix}}{\mathop{N{{a}_{2}}C{{O}_{3}}}}\,+3{{H}_{2}}O\xrightarrow{{}}\underset{\begin{smallmatrix} Sodium \\ metaalu\min ate \end{smallmatrix}}{\mathop{2NaAl{{O}_{2}}}}\,+C{{O}_{2}}+3{{H}_{2}}\]
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