Q69 / 180 · AIIMS 2004 · Chemistry

Assertion : Copper metal gets readily corroded is an acidic aqueous solution. Reason : Free energy change for this process is positive.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion
  • C
    If assertion is true but reason is false
  • Correct answer
    D
    If both assertion and reason are false.

Solution

Copper corrodes at negligible rate in unpolluted air, water and deaerated non-oxidising acids. Pure copper and the high copper alloys can be considered to exhibit similar resistance to most Corrosive environments. They possess excellent resistance to atmospheric environments. (corrossion is a spontaneous process for which free energy change must be negative.

Hence, the correct answer is option: 'D'.

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