Multiple choice

Which of the following statements is incorrect?

  1. Mn is the third most abundant transition element in the earth’s crust.

  2. Constantan is a copper-nickel alloy.

  3. [NiCl4]2- is paramagnetic in nature.

  4. Mn2+ is oxidising in nature.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The change from Mn2+ to Mn3+ results in the half-filled d orbital (d5), which has extra stability. Hence, Mn2+ is reducing in nature.

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