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ZnO crystal on heating acquires the form...

ZnO crystal on heating acquires the formula `Zn_(1+x)` O. Give reason.

Text Solution

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On heating ZnO, it loses oxygen and there is excess of `Zn^(2+)` ions in the crystal.
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Give reason : (i)ZnO crystal on heating acquires the formula Zn_(1+x)O . (ii)There is an increase in conductivity when Silicon is doped with Phosphorus.

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Knowledge Check

  • Zince oxide loses oxygen on heating accroding to the reaction ZnOoverset("heat") to Zn^(2+)(1)/(2)O_(2)+2e^(-) It becomes yellow heating because

    A
    `Zn^(2+)` ions and electrons move the intertitial sites and F-centres are created
    B
    Oxygen and electrons move out of the crystal and ions become yellow
    C
    `Zn^(2+)` again combine with oxygen to give yellow oxide
    D
    `Zn^(2+)` are replaceed by oxygen

  • 50 g of ZnS are strongly heated in air to effect partial oxidation and the resultant mass weighed 44 g . What is the ratio of ZnO to ZnS in the resultant mixture :

    A
    `13.5 : 30.5`
    B
    `27 : 12.58`
    C
    `27 : 15.31`
    D
    `30.52 : 13.48`

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