Case Study:

A 32-year-old athlete met with a serious accident during a football match and suffered a fracture in his leg bone. Doctors used titanium plates and screws to hold the broken bone in place. Surprisingly, even after remaining inside the body for many years, the titanium implant did not rust, corrode, or react with body fluids. On the other hand, doctors explained that ordinary iron cannot be used directly for such implants because it reacts with oxygen and moisture present in the body, leading to rust formation and possible health risks.

Struggling to remember why different elements behave this way? Check out this quick guide on Metals vs Non-Metals: How to Remember Their Properties Easily to master the core differences in minutes.

During a medical science seminar, students were shown a comparison report of different metals used in surgical implants. Iron showed signs of corrosion within a few weeks when exposed to saline solution, while titanium remained unchanged even after several months. Scientists observed that titanium forms a thin protective oxide layer on its surface, which prevents further reaction. This property is known as corrosion resistance.

Researchers also explained that titanium is often mixed with small amounts of other metals to form alloys. These alloys are strong, lightweight, and less reactive, making them suitable for medical applications. In contrast, highly reactive metals may release harmful ions into the body, causing irritation or tissue damage.

This raised an important question among students: Why are some metals safe inside the human body while others are not? The answer lies in the reactivity of metals and their ability to resist corrosion under different environmental conditions.

Teacher & Student Note:  To visually map out where titanium and iron stand compared to other elements, take a look at our breakdown: Reactivity Series Made Simple: A Student’s Guide.

CASE-BASED QUESTIONS

 MCQ 

Q1. Why is titanium preferred over ordinary iron for surgical implants?
A. Titanium is softer than iron
B. Titanium has high corrosion resistance
C. Titanium reacts quickly with body fluids
D. Titanium is a non-metal

Q2. The protective oxide layer formed on titanium mainly helps to:
A. Increase the weight of the implant
B. Make titanium highly reactive
C. Prevent further corrosion of the metal
D. Change titanium into a non-metal

 Assertion - Reason 

Q3. Assertion (A): Titanium implants can remain inside the human body for years without rusting.
Reason (R): Titanium forms a stable oxide layer that protects it from further reaction.
A. Both A and R are true, and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true, but R is false
D. A is false, but R is true

 Application-Based 

Q4. A doctor accidentally uses an untreated iron plate instead of a titanium plate during surgery. Predict one possible problem that may arise after some time.

Q5. A company is designing metal implants for patients living in coastal areas where moisture levels are high. Which property should engineers focus on while selecting the metal and why?

 Data/Logic-Based 

Q6. The following observations were recorded when different metals were placed in saline solution for 60 days:

Based on the data, which metal is most suitable for long-term surgical implants? Give one scientific reason.

 Application + Reasoning  

Q7. Titanium alloys are preferred in modern bone implants even though titanium is expensive. Explain why doctors still choose titanium alloys for medical use.

ANSWER KEY WITH EXPLANATION

A1. B. Titanium has high corrosion resistance
Explanation: Titanium does not react easily with body fluids because it forms a protective oxide layer. This prevents corrosion and makes it safe for implants.

A2. C. Prevent further corrosion of the metal
Explanation: The oxide layer acts as a protective coating that stops air, moisture, and chemicals from reacting further with titanium.

A3. A. Both A and R are true, and R is the correct explanation of A
Explanation: Titanium remains stable inside the body because its oxide layer protects it from corrosion. Hence, the reason correctly explains the assertion.

A4. The iron plate may start rusting inside the body due to moisture and dissolved salts. This corrosion can weaken the implant and may also damage nearby tissues.
Explanation: Iron is more reactive than titanium and undergoes corrosion easily in moist conditions.

A5. Engineers should focus on corrosion resistance because high moisture increases the chances of rusting and chemical reactions in metals.
Explanation: Metals with high corrosion resistance remain stable for longer periods in humid conditions.

A6. Titanium is the most suitable metal because it showed no visible change even after 60 days.
Explanation: This indicates excellent corrosion resistance and low reactivity, making titanium safe for long-term implants.

A7. Titanium alloys are strong, lightweight, and highly resistant to corrosion. They also do not react easily with body fluids, making them safer and more durable for implants.
Explanation: The alloy combines strength with low reactivity, which is important for medical applications.

Curious about how other materials shape our world? Explore more fascinating applications in Top Real-Life Uses of Metals and Non-Metals You Didn’t Know.

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Test yourself under exam conditions with our Class 10 Chemistry Unsolved Practice Papers.
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HOTS EXTENSION QUESTIONS

Q1. Suppose scientists discover a new metal that is stronger than titanium but reacts slowly with body fluids. Would it still be suitable for implants? Justify your answer.

Q2. Predict what may happen if the protective oxide layer on titanium is continuously damaged inside the body over time. How could engineers reduce this risk?