Question

Explain why
i.) Co is heated with ZnO.
ii.) Hydrogen alumina is treated with NaOH solution.

Answer 1

>> co is heated with ZnO because co get absorbed on the surface of ZnO.

Answer 2

(i) CO is heated with ZnO because CO acts as a reducing agent, when CO reacts with ZnO, it reduces ZnO to Zn.
ZnO + CO ----→ Zn + CO2

(ii) Hydrogen alumina is treated with NaOH solution because it forms dissolves in the latter (because of the formation of sodium meta-aluminate).
Al2O3. 2 H2O + NaOH -----→ 2NaAlO2 + 3H2O

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