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Chapter 34: Problem 14

Which metal salt gives a violet coloured bead in the borax bead test? (a) \(\mathrm{Co}^{2+}\) (b) \(\mathrm{Mn}^{2+}\) (c) \(\mathrm{Ni}^{2+}\) (d) \(\mathrm{Fe}^{2+}\)

Short Answer

Expert verified
Cobalt ( \( \mathrm{Co}^{2+} \) ) gives a violet colored bead in the borax bead test.

Step by step solution

01

Understanding the Borax Bead Test

The borax bead test is a qualitative test in which a metal oxide is introduced to a flame with borax. The metal ions present in the sample give a characteristic color to the bead when heated in the oxidizing and reducing flames. This makes it possible to identify different metals based on the bead's color.
02

Identify Metal Salts and Usual Bead Colors

Determine the typical bead colors produced by each metal ion when involved in the borax bead test. Generally: - Cobalt (\( \mathrm{Co}^{2+} \)) gives a blue or violet bead.- Manganese (\( \mathrm{Mn}^{2+} \)) gives an amethyst (purplish) bead.- Nickel (\( \mathrm{Ni}^{2+} \)) produces a brown bead.- Iron (\( \mathrm{Fe}^{2+} \)) results in a brown or yellow bead, depending on the conditions.
03

Analyze the Options

Consider the color description provided in the problem: a violet colored bead. Check against each of the metal ions' typical bead colors determined in Step 2. Cobalt's bead color is described as blue or violet, which matches the problem's description of producing a violet bead.
04

Conclusion

Given that cobalt (\( \mathrm{Co}^{2+} \)) produces a violet bead in the borax bead test, it confirms cobalt is the metal salt that gives a violet colored bead. Thus, option (a) is correct.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Metal Ion Colors
Understanding the colors produced by various metal ions in different tests, like the borax bead test, is essential in chemistry. It helps identify the presence of specific metals. During the test, each metal ion produces a unique color due to the excitement and relaxation of electrons. This property is used extensively in qualitative analysis.
  • Cobalt (\( \mathrm{Co}^{2+} \)): Produces a deep blue or violet color. This makes it easy to recognize in tests.
  • Manganese (\( \mathrm{Mn}^{2+} \)): Known for its beautiful amethyst, or purplish, hue. This helps differentiate it from other ions.
  • Nickel (\( \mathrm{Ni}^{2+} \)): Results in a less vibrant brown bead, not to be confused with cobalt or manganese.
  • Iron (\( \mathrm{Fe}^{2+} \)): Typically shows a brown or yellow coloration, varying with conditions.
These distinct colors result from the transitions of electrons within the metal's atoms or ions when they gain enough energy from the flame in the test. This fundamental characteristic is critical in performing accurate qualitative analysis.
Qualitative Analysis
Qualitative analysis in chemistry refers to processes that determine the composition or identity of substances. The borax bead test is a classic example of one such technique. By introducing a substance to a flame, chemists can observe the color of the bead to identify metal ions.
  • Informs about the presence of elements, not the quantity.
  • Utilizes visual cues, like color change, to make determinations.
  • Can be conducted in oxidizing or reducing conditions, each of which might affect the final color of the beads.
Qualitative analysis helps to quickly sort through possibilities and narrow down which elements are in the sample. Using this method in combination with other tests increases the reliability of the results and clarity in determining the substances present.
Chemistry Practical Techniques
Practical techniques in chemistry like the borax bead test are vital for understanding the properties of substances through hands-on experiments. These methods let students see theories in action, reinforcing their learning.
The borax bead test in particular demonstrates key skills:
  • Recognizing and interpreting color changes to identify metal ions.
  • Utilizing flames to oxidize or reduce metal ions, affecting their bead colors.
  • Understanding the chemical properties and behaviors exhibited by different metal ions under heat.
Hands-on experiments ensure that students not only learn theoretical concepts but also know how to apply them practically. This is essential in building a solid foundation in the science of chemistry.

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Most popular questions from this chapter

Which is not true about Libermann nitroso test? (a) Here the blue colour is due to formation of sodium salt of indophenol (b) It is given by nitrophenols (c) It is also given by \(\mathrm{p}-\) substituted phenols (d) Both (b) and (c)

The aqueous solution of the following salts will be coloured (a) \(\mathrm{LiNO}_{3}\) (b) \(\mathrm{CrCl}_{3}\) (c) \(\mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}\) (d) potash alum

Which of the following is not a correct statement? (a) The aqueous solution of potash alum is acidic due to cationic hydrolysis. (b) Mohr's salt is a double salt (c) Aniline yellow is also called p-amino azobenzene. (d) Iodoform can be prepared from methanol also by haloform reaction.

A substance on treatment with dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. These reactions indicate the presence of (a) \(\mathrm{CO}_{3}^{2-}\) (b) \(\mathrm{S}^{2-}\) (c) \(\mathrm{SO}_{3}^{2-}\) (d) \(\mathrm{NO}_{2}^{-}\)

Pick out the correct statement(s) here: (1) Golden yellow \(\mathrm{PbI}_{2}\) dissolves in hot water to give a colourless solution. (2) \(\mathrm{Ba}^{2+}\) and \(\mathrm{Ca}^{2+}\) ions can be separated by adding \(\mathrm{CrO}_{4}^{2-}\) ion in acetic acid medium (3) Salts of calcium, copper and nickel give a green flame colour. (4) The sulphide ion gives with alkaline sodium nitroprusside a violet colour. (a) 1 and 3 (b) 2 and 4 (c) 1,2 and 4 (d) 2,3 and 4
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