1
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.
2
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
3
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Which one of the following ions is the most stable in aqueous solution?
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
A
V3+
B
Ti3+
C
Mn3+
D
Cr3+
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Identify the incorrect statement among the following:
A
Lanthanoid contraction is the accumulation of successive shrinkages.
B
As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
C
Shielding power of 4$$f$$ electrons is quite weak.
D
There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
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