Consider the following elements found in a typical 70 kg man and arrange them in correct increasing order.
1. Sodium 2. Potassium 3. Copper 4. Iron Select the correct answer from the code given below:
- A4, 3, 2, 1
- B3, 4, 1, 2
- C3, 4, 2, 1
- D4, 3, 1, 2
Show answer and explanation
Correct answer: (b) 3, 4, 1, 2
Explanation
Copper is a trace element, present in the smallest amount (~0.1 g) in a 70 kg body.
Iron follows at ~3–4 g, then Sodium at ~100 g.
Potassium is the most abundant of these (~140 g), giving the order Cu < Fe < Na < K (3, 4, 1, 2).