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Practice each question, then open the answer or worked solution.
Why is FeO (s) not formed in stoichiometric composition?
The composition of Fe2+ and O2 ions is not 1:1 it is 0.95:1. This can be obtained if and only if a small number of Fe2+ ions are replaced by two-thirds of Fe3+ in OH sites
Why does white ZnO (s) become yellow upon heating?
When ZnO is heated, it gives Zn2+ electrons. The excess Zn ions get trapped in the interstitial site and vacant sites, also. The yellow colour is due to this electron and electrical conductivity in crystals.
Why does the electrical conductivity of semiconductors increase with a rise in temperature?
The energy gap between the valence band and conduction band is small, at room temperature, they do not conduct electricity but raise the electrons to get enough amount of energy to excite from the valence band to the conduction band. This is called thermodynamic conduction in intrinsic semiconductors
Class 12 Chemistry NCERT Exemplar Problems for Solid StateIn this chapter, students will learn about the constituent particles in crystalline solids arranged in a regular pattern which extends throughout the crystal in amorphous solids, the arrangement of constituent particles has only short-range order, and consequently, they behave like supercooled liquids. Practise higher-level questions from this chapter by solving the NCERT Exemplar Class 12 Chemistry Chapter 1 Solid State.
Concepts Covered in Chapter 1 The Solid State