1
IIT-JEE 2004 Screening
MCQ (Single Correct Answer)
+1
-0.25
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)
2
IIT-JEE 2003 Screening
MCQ (Single Correct Answer)
+2
-0.5
Which of the following pairs are isoelectronic and isostructural?
$$NO_3^-$$, $$CO_3^{2-}$$, $$ClO_3^-$$, SO3
A
$$NO_3^-$$, $$CO_3^{2-}$$
B
SO3, $$NO_3^-$$
C
$$ClO_3^-$$, $$CO_3^{2-}$$
D
$$CO_3^{2-}$$, SO3
3
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+1
-0.25
Rutherford's experiment, which established the nuclear model of the atom, used a beam of
A
$$\beta-particles$$, which impinged on a metal foil and got absorbed
B
$$\gamma-particles$$, which impinged on a metal foil and ejected electrons
C
helium atoms, which impinged on a metal foil and got scattered
D
helium nuclei, which impinged on a metal foil and got scattered
4
IIT-JEE 2002 Screening
MCQ (Single Correct Answer)
+2
-0.5
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
JEE Advanced Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
CBSE
Class 12