Give reasons A mixture of dilute NaOH and aluminium pieces is used to

1.	Give reasons A mixture of dilute NaOH and aluminium pieces is used to open blocked drain.
Answer» Solution :Sodium HYDROXIDE and aluminium react to FORM sodium tetra hydroxoaluminate(III) and hydrogen gas. The pressure of the produced hydrogen gas is used to open blocked drains. `2Al_((s)) + 2NaOH + 2H_2O_((L)) to 2NaAlO_(2(aq)) + 3H_(2(g))`

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