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1
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following pairs of metals is purified by van-Arkel method?
A
Ga and In
B
Zr and Ti
C
Ag and Au
D
Ni and Fe
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
A
The $$\Delta $$G$$_f^o$$ of the sulphide is greater than those for CS2 and H2S.
B
The $$\Delta $$G$$_f^o$$ is negative for roasting of sulphide ore to oxide.
C
Roasting of the sulphide to the oxide is thermodynamically feasible.
D
Carbon and hydrogen are suitable reducing agents for metal sulphides.
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
A
Galena
B
Copper pyrite
C
Sphalerite
D
Argentite
4
AIPMT 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The method of zone refining of metals is based on the principle of
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
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