11.22.    Give reasons :

  (ii) A mixture of dilute N\! aO\! H and aluminium pieces is used to open drain.

Answers (1)
M manish

When the mixture of dilute N\! aO\! H and aluminium pieces reacts, they formed sodium tetrahydroxy aluminate (III)and dihydrogen gas. To open the drains, we use the pressure produced by the hydrogen gas.

2Al+NaOH+6H_{2}O\rightarrow 2Na+[Al(OH)_{4}]^{-}+3H_{2}

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