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Chapter 9: Problem 43

Which of the following imparts purple colour to glass? (a) \(\mathrm{Cr}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{AuCl}_{3}\) (c) \(\mathrm{Cu}_{2} \mathrm{O}\) (d) \(\mathrm{MnO}_{2}\)

Short Answer

Expert verified
Answer: (d) MnO₂ (manganese(IV) oxide)

Step by step solution

01

Understanding the role of colorants in glass

Glass coloring is commonly achieved by adding metal oxides to the glass mixture. These metal oxides form various colored compounds that contribute to the final appearance of the glass. The color produced by a specific metal oxide can vary depending on its concentration.
02

Applying a general rule for glass coloring

In glass manufacturing, a general rule is that transition metal oxides usually deliver a spectrum of highly saturated colors.
03

Identifying the transition metal oxides among the given substances

Among the given substances, \(\mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Cu}_{2} \mathrm{O}\) and \(\mathrm{MnO}_{2}\) are transition metal oxides.
04

Eliminating options based on known colors imparted

Chromium(III) oxide (\(\mathrm{Cr}_{2} \mathrm{O}_{3}\)) imparts green color, and Copper(I) oxide ((\(\mathrm{Cu}_{2} \mathrm{O}\))) imparts a red color to glass. We can now eliminate both these options.
05

Identifying the correct answer

By process of elimination, we are left with only one transition metal oxide option, \(\mathrm{MnO}_{2}\) (manganese(IV) oxide), which is known for imparting purple color to glass. Therefore, the correct answer is (d) \(\mathrm{MnO}_{2}\).

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