Consider the following elements found in a typical 70 kg man and arrange them in correct increasing order.1.Sodium2.Potassium3.Copper4.IronSelect the correct answer from the code given below:

1. A

   4, 3, 1, 2

   4, 3, 1, 2. Puts iron before copper; copper is the smallest store.

2. B

   3, 4, 2, 1

   3, 4, 2, 1. Puts potassium before sodium.

3. C

   3, 4, 1, 2

   3, 4, 1, 2. Copper → iron → sodium → potassium (increasing mass in a typical 70 kg body).

4. D

   4, 3, 2, 1

   4, 3, 2, 1. Iron first; potassium before sodium.

Summary. Official key is (c) 3, 4, 1, 2. Cu, Fe, Na, K. Also note: K largest — Intracellular cation; Na next — Extracellular; Fe ~4 g — Haemoglobin; Cu trace — Enzymes; milligrams.