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Zinc oxide, white in colour at room temp...

Zinc oxide, white in colour at room temperature, acquires yellow colour on heating due to:

A

Zn being a transition element

B

paramagnetic nature of the compound

C

trapping of electrons at the site vacated by oxide ions

D

Both (A) & (B)

Text Solution

Verified by Experts

The correct Answer is:
C
Some of `O^(2-)` combine with each other forming `O_2` gas which is liberated leaving electrons at the site vacated by oxides ions
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Knowledge Check

  • ZnO shows yellow colour on heating due to

    A
    `Zn^(2+)` ions and electrons move to interstitial sites and F-centres are called
    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 replaced by oxygen

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