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1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Which one of the following constitutes a group of the isoelectronic species?
A
$$C_2^{2 - }$$, $$O_2^{-}$$, CO, NO
B
$$NO^{+}$$, $$C_2^{2 - }$$, CN-, $$N_2$$
C
CN-, $$N_2$$, $$O_2^{2-}$$, $$C_2^{2 - }$$
D
$$N_2$$, $$O_2^{-}$$, $$NO^{+}$$, CO
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
The ionization enthalpy of hydrogen atom is 1.312 × 106 J mol−1. The energy required to excite the electron in the atom from n = 1 to n = 2 is
A
8.51 × 105 J mol−1
B
6.56 × 105 J mol−1
C
7.56 × 105 J mol−1
D
9.84 × 105 J mol−1
3
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Which of the following sets of quantum numbers represents the highest energy of an atom?
A
n = 3, l = 0, m = 0, s = +1/ 2
B
n = 3, l = 1, m = 1, s = +1/ 2
C
n = 3, l = 2, m = 1, s = +1/ 2
D
n = 4, l = 0, m = 0, s = +1/ 2
4
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
According to Bohr's theory, the angular momentum of an electron in 5th orbit is
A
10 $$h/\pi$$
B
2.5 $$h/\pi$$
C
25 $$h/\pi$$
D
1.0 $$h/\pi$$
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