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STD 12 - 2. Electrochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 2. Electrochemistry4 Marks
MCQ
Assertion : Copper metal gets readily corroded in an acidic aqueous solution.

Reason : Free energy change for this process is positive.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • ✓
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: D.
If both the Assertion and Reason are incorrect.
d
Copper lies below hydrogen in electrochemical series so it cannot displace $H_2$ from dilute acids. Hence it is not easily corroded in acidic solutions. Further, corrosion is a spontaneous process for which free energy change must be negative.

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