Multiple choice

Which of the following statements are incorrect?

  1. 4f orbital electrons are less shielded than 5f orbital electrons.
  2. Iron is the most abundant element in the Earth's crust.
  3. Zr and Hf have almost the same atomic radius
  4. Constantan is a copper-nickel alloy.

Select the correct answer using codes given below:

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

5f orbital is more effectively shielded from nuclear charge than 4f orbital. Iron is the fourth most abundant element in the Earth's crust.

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