A student took four test tubes and labelled them as A, B, C and D. He added equal volume of freshly-prepared copper sulphate to each test tube. He added a clean iron nail, a zinc granule, a piece of clean magnesium ribbon and a piece of clean silver wire to test tubes A, B, C and D respectively. In which test tube, the blue colour of the copper sulphate solution will not disappear?
a. Test tube A
b. Test tube B
c. Test tube C
d. Test tube D
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Answer:
D is the correct Answer
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The blue color of copper sulfate does not disappear in test tube D.(option d)
What is the standard reduction potential (E⁰)?
- The standard reduction of potential is a measure of the tendency of an element to get reduced.
- The reactivity series developed considers the potential of Hydrogen to be 0 and measures the potential of other elements against it.
- A higher position on the reactivity series implies that the element has a higher tendency to get reduced than hydrogen.
When does the blue color of the copper sulfate solution disappear?
- According to the reactivity series, the order of the standard reduction potential in decreasing order is:
Ag > Cu > Fe > Zn > Mg
- This means that Iron, Zinc, and Magnesium can displace copper from copper sulfate solution, leading to its discoloration.
- Only silver cannot displace copper.
Hence, the correct option is d. Test tube D.
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