1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 $$\times$$ 107 m-1)
A
406 nm
B
192 nm
C
91 nm
D
9.1 $$\times$$ 10-8 nm
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Which one of the following sets of ions represents the collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)
A
K+, Cl-, Mg2+, Sc3+
B
Na+, Ca2+, Sc3+, F-
C
K+, Ca2+, Sc3+, Cl-
D
Na+, Mg2+, Al3+, Cl-
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
The orbital angular momentum for an electron revolving in an orbit is given by $$\sqrt {l(l + 1)} {h \over {2\pi }}$$. This momentum for an s-electron will be given by
A
zero
B
$${h \over {2\pi }}$$
C
$$\sqrt 2 {h \over {2\pi }}$$
D
$$ + {1 \over 2}{h \over {2\pi }}$$
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Which one of the following groupings represents a collection of isoelectronic species? (At. nos. : Cs : 55, Br : 35)
A
N3-, F-, Na+
B
Be, Al3+, Cl-
C
Ca2+, Cs+, Br
D
Na+, Ca2+, Mg2+
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