Question

Assertion : For biological functions in human body, barium is not required.
Reason : Barium is a divalent ion.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

For biological functions of human body, we need monovalent $Na$ and $K$ ions and divalent $Mg$ and $Ca$ ions, which are found in large proportions in biological fluids.