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Which one of the following scrap metals cannot be separated by magnetic separation?
  • a)
    Cobalt
  • b)
    Chromium
  • c)
    Steel
  • d)
    Nickel
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which one of the following scrap metals cannot be separated by magneti...
Magnetic separation works only on ferromagnetic materials (those strongly attracted to magnets).
  • Cobalt, Steel, and Nickel → All are ferromagnetic, so they can be separated using magnetic separation.
  • Chromium → Not ferromagnetic (it is antiferromagnetic in bulk and paramagnetic at room temperature), so it cannot be separated by magnetic separation.
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Community Answer
Which one of the following scrap metals cannot be separated by magneti...
Understanding Magnetic Separation
Magnetic separation is a process used to separate magnetic materials from non-magnetic materials. This technique is particularly effective in recycling processes and mining operations.
Scrap Metals and Magnetism
When we talk about scrap metals and their separability through magnetic separation, we need to consider their magnetic properties:
  • Cobalt: This metal is ferromagnetic, meaning it can be magnetized and is attracted to magnets.
  • Chromium: This is a paramagnetic material, which means it has a very weak attraction to magnetic fields but does not retain magnetism.
  • Steel: Steel is an alloy primarily composed of iron, making it ferromagnetic and easily separable using magnets.
  • Nichol: Like cobalt and steel, nickel is also ferromagnetic and can be separated using magnetic methods.

Why Chromium Cannot be Separated by Magnetic Separation
Chromium stands out among the options given:
  • Non-Ferromagnetic Nature: Chromium does not exhibit strong magnetic properties and is not attracted to magnets like ferromagnetic materials.
  • Separation Challenges: Due to its weak magnetic characteristics, chromium cannot be effectively separated from other materials using magnetic separation techniques.

Conclusion
In summary, the correct answer is option 'B' (Chromium) because it does not possess the properties necessary for magnetic separation, while the other metals listed do. Understanding these properties is crucial for efficient recycling and material recovery processes.
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