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Question
Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.
Solution
Sodium hydroxide and aluminium react to form sodium tetrahydroxoaluminate(III) and hydrogen gas. The pressure of the produced hydrogen gas is used to open blocked drains.
\[\ce{2 Al + 2NaOH + 6H_2O -> 2 Na^+[Al(OH)_4] + 3H_2}\]
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