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Acidic,Basic Natures of Oxides

21. Which is ...

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21. Which is the most basic oxide? a) ZnO b) MgO c) Al2 O3 d) N2 O5

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Q. Give the order of melting points:

N a O, M g O, {A l}_{2} O_{3}

Q. The Gibbs energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 96 k J

The voltage needed for the electrolytic reduction of aluminium oxide (

{A l}_{2} O_{3}

500^{o} C

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

Q. The Gibbs' energy for the decomposition of

{A l}_{2} O_{3}

500^{o} C

\frac{2}{3} {A l}_{2} O_{3} \to \frac{4}{3} A l + O_{2}; Δ_{r} G = + 960 k J {m o l}^{- 1}

The potential difference needed for the electrolytic reduction of aluminium oxide

({A l}_{2} O_{3})

500^{o} C

Q. Consider the given oxides

C O, N a_{2} O, A l_{2} O_{3}, M g O, C O_{2}, Z n O, S O_{2}

The total number of basic oxides in the given box is

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Acidic,Basic Natures of Oxides

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