1

IIT-JEE 2010

MCQ (Single Correct Answer)
The hydrogen like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

Energy of the state S1 in units of the hydrogen atom ground state energy is:
A
0.75
B
1.50
C
2.25
D
4.50
2

IIT-JEE 2010

MCQ (Single Correct Answer)
The hydrogen like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

The state S1 is :
A
1s
B
2s
C
2p
D
3s
3

IIT-JEE 2009 Screening

MCQ (Single Correct Answer)
Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively
A
55.85
B
55.95
C
55.75
D
56.05
4

IIT-JEE 2008

MCQ (Single Correct Answer)
STATEMENT - 1 : The plot of atomic number (y-axis) versus number of neutrons (x-axis) for stable nuclei shows a curvature towards x-axis from the line of 45o slope as the atomic number is increased.
STATEMENT - 2 : Proton-proton electrostatic repulsions begin to overcome attractive forces involving protons and neutrons in heavier nuclides
A
Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1
B
Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement - 1
C
Statement - 1 is true, Statement - 2 is False
D
Statement - 1 is False, Statement - 2 is True

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