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Question

Consider the following vitamins.
1. Vitamin D
2. Vitamin B12
3. Vitamin K
4. Vitamin C
Which of them are water soluble?

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
Only 2 and 4

Vitamins: Water-Soluble Identification

Understanding vitamin solubility is key. Vitamins are classified based on whether they dissolve in water or fat.

  • Water-Soluble Vitamins: Dissolve in water. The body typically excretes excess amounts, requiring regular intake. Examples include Vitamin C and B vitamins (like B12).
  • Fat-Soluble Vitamins: Dissolve in fat. They are stored in the body's fatty tissues and liver. Examples include Vitamins A, D, E, and K.

Vitamin Classification from List

Applying this classification to the vitamins provided:

  • 1. Vitamin D: Fat-soluble
  • 2. Vitamin B12: Water-soluble
  • 3. Vitamin K: Fat-soluble
  • 4. Vitamin C: Water-soluble

Identifying Water-Soluble Vitamins

The vitamins from the list that are water-soluble are Vitamin B12 (numbered 2) and Vitamin C (numbered 4).

Therefore, the correct option is the one that includes only vitamins 2 and 4.

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Important Questions from Biomolecules

  1. What is the other name for Riboflavin?

  2. Which of the following is another name for Vitamin K1?

  3. Which of the following is an inactivated Vitamin D?

  4. Which vitamin is also known as Thiamin?

  5. Which vitamin among the following is crucial for blood clotting?

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