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Chapter 21: Problem 5

Write short notes on: (1) Perrhenates (2) Tungsten bronzes

Short Answer

Expert verified
Perrhenates are the salts of perrhenic acid and contain a perrhenate ion. They are chemically and thermally stable. Tungsten bronzes are non-stoichiometric compounds with interesting electrical and optical properties.

Step by step solution

01

Understand Perrhenates

Perrhenates are the salts of perrhenic acid. They contain the perrhenate ion (\( \text{ReO}_4^- \)), which has the rhenium atom in the +7 oxidation state. Perrhenates are generally soluble in water and are very stable, both thermally and chemically.
02

Understand Tungsten Bronzes

Tungsten bronzes are not actual 'bronzes' (alloys of copper and tin), but are non-stoichiometric compounds of tungsten oxides that contain alkali metal ions within their structures. They have general formula \( \text{M}_x\text{WO}_3 \), where M represents an alkali metal and \( x \) ranges between 0 and 1. Tungsten bronzes are known for their interesting electrical and optical properties. For example, some can behave as semi-conductors, while others have metallic properties.

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