1

IIT-JEE 2006

MCQ (Single Correct Answer)
According to Bohr's theory
En = Total energy, Kn = Kinetic Energy, Vn = Potential Energy, rn = Radius of nth orbit
Match the following

Column I

(A) Vn/Kn = ?
(B) If radius of nth orbit $$ \propto E_n^x,x = ?$$
(C) Angular momentum in lowest orbital
(D) $${1 \over {{r_n}}} \propto {Z^y},y = ?$$

Column II

(p) 0
(q) -1
(r) -2
(s) 1
A
(A) $$\to$$ r, (B) $$\to$$ p, (C) $$\to$$ q, (D) $$\to$$ s
B
(A) $$\to$$ r, (B) $$\to$$ q, (C) $$\to$$ p, (D) $$\to$$ s
C
(A) $$\to$$ s, (B) $$\to$$ p, (C) $$\to$$ q, (D) $$\to$$ r
D
(A) $$\to$$ p, (B) $$\to$$ r, (C) $$\to$$ q, (D) $$\to$$ s
2

IIT-JEE 2005 Screening

MCQ (Single Correct Answer)
The number of radial nodes of 3s and 2p orbitals are respectively
A
2, 0
B
0, 2
C
1, 2
D
2, 1
3

IIT-JEE 2004 Screening

MCQ (Single Correct Answer)
The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?
A
He+ (n = 2)
B
Li2+ (n = 2)
C
Li2+ (n = 3)
D
Be3+ (n = 2)
4

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)
If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates
A
Heisenberg uncertainty principle
B
Hund's rule
C
Pauli exclusion principle
D
Bohr postulate of stationary orbits

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