1.

Write balanced chemical equations for the following reactions : (i) When copper is heated in air. (ii) When aluminium is heated in air. (iii) Aluminium oxide reacts with Sodium hydroxide.

Answer» (i) `2Cu + underset("(air)")(O_(2)) overset("Heat")to 2CuO`
(ii) `4Al + underset("(air)")3O_(2) overset("Heat")to 2Al_(2)O_(3)`
(iii) `Al_(2)O_(3) + 2NaOH to 2NaAlO_(2) + H_(2)O`


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