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Question
Give reasons: A mixture of dilute NaOH and aluminium pieces is used to open drain.
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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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