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The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State3 Marks
Question
  1. Based on the nature of intermolecular forces, classify the following solids:
Silicon carbide, Argon
  1. $ZnO$ turns yellow on heating. Why?
  2. What is meant by groups $12-16$ compounds? Give an example.
✓

Answer

  1. Covalent solid/network solid, molecular solid
$\text{ZnO}\xrightarrow{\text{ }\text{ }\text{Heating}\text{ }\text{ }\text{ }}\text{ }\text{Zn}^{2+}+1/2\text{ }\text{O}_2+2\text{e}^-$
  1. Because excess $Zn^{2+}$ ions move to interstitial sites and the electrons move to neighbouring voids.
  2. Compounds prepared by combination of groups $12$ and $16$ behave like semiconductors. For eg $ZnS,\ CdS,\ CdSe,\ HgTe.$

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