1
IIT-JEE 1996
Subjective
+5
-0
A 3.00 g sample containing Fe3O4, Fe2O3 and an inert impure substance is treated with excess of KI solution in presence of dilute H2SO4. The entire iron is converted into Fe2+ along with the liberation of iodine. The resulting solution is diluted to 100 ml, A 20 ml of the diluted solution requires 11.0 ml of 0.5 M Na2S2O3 solution to reduce the iodine present. A 50 ml of the diluted solution, after complete extraction of the iodine requires 12.80 ml of 0.25 M KMnO4 solution in the dilute H2SO4 medium for the oxidation of Fe2+. Calculate the percentages of Fe2O3 and Fe3O4 in the original sample.
2
IIT-JEE 1996
MCQ (Single Correct Answer)
+1
-0.25
The orbital angular momentum of an electron in 2s orbital is
A
$$ + {1 \over 2}.{h \over {2\pi }}$$
B
Zero
C
$${h \over {2\pi }}$$
D
$$\sqrt 2 .{h \over {2\pi }}$$
3
IIT-JEE 1996
Subjective
+1
-0
Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen.
4
IIT-JEE 1996
MCQ (Single Correct Answer)
+1
-0.25
Which of the following has the maximum number of unpaired electrons?
A
Mg2+
B
Ti3+
C
V3+
D
Fe2+
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