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प्रश्न
Account for the following:
Transition metals form alloys.
Explain why do transition metals form alloys among themselves.
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उत्तर १
Transition metals have very similar atomic sizes as a result one metal can easily replace the other metal from its lattice to form solid solution (alloy). Transition metals are also miscible with one another in the molten state. Thus, the molten state solution of two or more transition metals on cooling forms an alloy.
उत्तर २
- Transition metals have very similar atomic sizes.
- Because of this similarity, one metal atom can easily replace another in the metal lattice.
- This forms a solid solution called an alloy.
- Transition metals are also miscible in their molten state, meaning they mix well when melted.
- Upon cooling, the molten mixture solidifies as an alloy.
- These alloys are usually hard and have high melting points.
Thus, the similar atomic size and good miscibility in the molten state lead transition metals to form alloys easily.
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संबंधित प्रश्न
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
Compare the stability of +2 oxidation state for the elements of the first transition series.
Mention the type of compounds formed when small atoms like H, C and N get trapped inside the crystal lattice of transition metals. Also give physical and chemical characteristics of these compounds.
Account for the following:
In case of transition elements, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number.
The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by
Match List - I with List - II.
| List - I | List - II | ||
| (A) | [Fe(CN)6]3− | (i) | 5.92 BM |
| (B) | [Fe(H2O)6]3+ | (ii) | 0 BM |
| (C) | [Fe(CN)6]4− | (iii) | 4.90 BM |
| (D) | [Fe(H2O)6]2+ | (iv) | 1.73 BM |
Choose the correct answer from the options given below.
The electrode potential of M2+/M of 3d-series elements shows the positive value for ______.
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Assertion (A): Transition metals show their highest oxidation state with oxygen.
Reason (R): The ability of oxygen to form multiple bonds to metals.
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
