Question:

Isomorphous binary phase diagram is formed between two components which exhibit

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"Iso" means same, "morphous" means form. They share the same form/structure across all ratios.
  • Complete liquid solubility but partial solid solubility
  • Complete solid solubility but partial liquid solubility
  • Partial liquid solubility as well as partial solid solubility
  • Complete liquid solubility as well as complete solid solubility
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The Correct Option is D

Solution and Explanation

Step 1: Concept
An isomorphous system is one where the two components are entirely soluble in each other in both the liquid and solid states.

Step 2: Meaning

This typically occurs in systems like Copper-Nickel where the Hume-Rothery rules are satisfied (similar atomic size, crystal structure, and electronegativity).

Step 3: Analysis

"Complete solubility" means only one phase exists across the entire composition range at appropriate temperatures.

Step 4: Conclusion

An isomorphous binary phase diagram represents complete liquid and complete solid solubility. Final Answer: (D)
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