1
IIT-JEE 2001 Screening
MCQ (Single Correct Answer)
+1
-0.25
The quantum numbers +1/2 and -1/2 for the electron spin represent
A
rotation of the electron in clockwise and anticlockwise direction respectively
B
rotation of the electron in anticlockwise and clockwise direction respectively
C
magnetic moment of the electron pointing up and down respectively
D
two quantum mechanical spin states which have no classical analogue
2
IIT-JEE 2000 Screening
MCQ (Single Correct Answer)
+1
-0.25
The number of nodal planes in a px orbital is
A
one
B
two
C
three
D
zero
3
IIT-JEE 2000 Screening
MCQ (Single Correct Answer)
+1
-0.25
The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1 This represents its
A
excited state
B
ground state
C
cationic form
D
anionic form
4
IIT-JEE 1999
MCQ (Single Correct Answer)
+2
-0.5
The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as
A
(iv)<(ii)<(iii)<(i)
B
(ii)<(iv)<(i)<(iii)
C
(i)<(iii)<(ii)<(iv)
D
(iii)<(i)<(iv)<(ii)
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