In alloy steels (substitutional alloys), which of the following transition metal cannot be substituted in place of iron:
Correct answer: D. Ti
- A. Cr
- B. Ni
- C. Mn
- D. Ti
Explanation
The correct answer is Titanium (Ti). Titanium's atomic size and bonding characteristics make it less suitable for substitution in iron-based alloy steels. While chromium, nickel, and manganese are commonly used in alloy steels to enhance properties such as corrosion resistance, toughness, and hardness, titanium does not fit well within the atomic structure of iron. This is due to its larger atomic size and different bonding preferences, which can disrupt the alloy's matrix rather than enhance it.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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