1
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
2
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+
3
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.
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)
A
[Fe(H2O)6]2+
B
[Ni(H2O)6]2+
C
[Cr(H2O)6]2+
D
[Mn(H2O)6]2+
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12