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.

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

### 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
3

### 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
4

### IIT-JEE 2008

MCQ (Single Correct Answer)
Match the entries with column I with with the correctly related quantum number(s) in Column II.

Column I

(A) Orbital angular momentum of the electron in a hydrogen-like atomic orbital
(B) A hydrogen-like one-electron wave function obeying Pauli principle
(C) Shape, size and orientation of hydrogen like atomic orbitals
(D) Probability density of electron at the nucleus in hydrogen like atom

Column II

(p) Principal quantum number
(q) Azimuthal quantum number
(r) Magnetic quantum number
(s) Electron spin quantum number
A
(A) $\to$ q,r; (B) $\to$ p,q,r; (C) $\to$ p,q,r; (D) $\to$ q,r;
B
(A) $\to$ q,r; (B) $\to$ p,q,r,s; (C) $\to$ p,q; (D) $\to$ s,r;
C
(A) $\to$ r,s; (B) $\to$ p,q,r; (C) $\to$ p,q,r; (D) $\to$ p,q;
D
(A) $\to$ q,r; (B) $\to$ p,q,r,s; (C) $\to$ p,q,r; (D) $\to$ p,q;

### Joint Entrance Examination

JEE Advanced JEE Main

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NEET

Class 12