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A bone kept in dil HCl for three days sh...

A bone kept in dil HCl for three days shall

A

Remain unaltered

B

Become soft

C

Break in pieces

D

Dissolve completely.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Composition of Bone:** - Bones are primarily composed of calcium phosphate, along with other minerals (like potassium) and organic components (such as collagen and vitamins). 2. **Introduction to Dilute HCl:** - Dilute hydrochloric acid (HCl) is a strong acid that can react with various substances, including minerals. 3. **Reaction of Bone with Dilute HCl:** - When a bone is placed in dilute HCl, the acid reacts with the calcium phosphate present in the bone. This reaction leads to the dissolution of calcium from the bone. 4. **Effects of the Reaction:** - As the calcium is dissolved, the structural integrity of the bone is compromised. The bone loses its hardness and becomes soft and elastic due to the depletion of calcium. 5. **Evaluating the Options:** - **Option 1: Remain unaltered** - This is incorrect because the bone undergoes significant changes. - **Option 2: Becomes soft** - This is correct, as the bone loses calcium and becomes soft and elastic. - **Option 3: Break in pieces** - This is incorrect; while the bone may become more fragile, it does not necessarily break into pieces. - **Option 4: Dissolved completely** - This is incorrect; the bone does not dissolve completely, but it does lose a significant amount of calcium. 6. **Conclusion:** - The correct answer is that the bone becomes soft when kept in dilute HCl for three days. ---
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