Verified Solution • 2025–26 Session
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QAIPMT-2003-Ch-2679: NEET 2003 Chemistry - Class 12 AIPMT-2003-Ch-2679 Solution: The method of zone refining of metals is based on the principle …
The method of zone refining of metals is based on the principle of
Multiple Choice Options
- A greater mobility of the pure metal than that of the impurity
- B higher melting point of the impurity than that of the pure metal
- C greater noble character of the solid metal than that of the impurity
- D greater solubility of the impurity in the molten state than in the solid
Step-by-Step Verified Solution
AgI | _ | Ag + | + | I -
s | s | s
K sp = s 2
_ 1.0 _ 10 �16 = s 2
_ s = 1.0 _ 10 �8 mol L �1
_ [Ag + ] = 1.0 _ 10 �8 mol L �1
Also, in 10 �4 N KI solution,
[I �1 ]
= (10 �4 + 1.0 _ 10 �8 ) mol L �1
_ [I �1 ]
= (10 �4 ) mol L �1
[As 1.0 _ 10 �8 mol L �1 << 1.0 _ 10 �4 mol L �1 ]
_ K sp of AgI = [Ag + ][I � ]
= (1.0 _ 10 �8 )(10 �4 )
= 1.0 _ 10 �12 mol L �1