1
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Which of the following sets of ions represents a collection of isoelectronic species?
A
N3-, O2-, F-, S2-
B
Li+, Na+, Mg2+, Ca2+
C
K+, Cl-, Ca2+, Sc3+
D
Ba2+, Sr2+, K+, Ca2+
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Of the following sets which one does NOT contain isoelectronic species?
A
$$BO_3^{3 - }$$, $$CO_3^{2 - }$$, $$NO_3^{- }$$
B
$$SO_3^{2 - }$$, $$CO_3^{2 - }$$, $$NO_3^{-}$$
C
$$CN^{- }$$, $$N_2$$, $$C_2^{2 - }$$
D
$$PO_4^{3 - }$$, $$SO_4^{2 - }$$, $$ClO_4^{ - }$$
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
In a multi-electron atom, which of the following orbitals described by the three quantum members will have the same energy in the absence of magnetic and electric fields?
(A) n = 1, l = 0, m = 0
(B) n = 2, l = 0, m = 0
(C) n = 2, l = 1, m = 1
(D) n = 3, l = 2, m = 1
(E) n = 3, l = 2, m = 0
A
(D) and (E)
B
(C) and (D)
C
(B) and (C)
D
(A) and (B)
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Pick out the isoelectronic structure from the following :

$$\eqalign{ & \left( i \right)\,\,\,\,\,\,C{H_3}^ + \cr & \left( {ii} \right)\,\,\,\,{H_3}{O^ + } \cr & \left( {iii} \right)\,\,\,N{H_3} \cr & \left( {iv} \right)\,\,\,\,C{H_3}^ - \cr} $$
A
$$(i)$$ and $$(ii)$$
B
$$(iii)$$ and $$(iv)$$
C
$$(i)$$ and $$(iii)$$
D
$$(ii), (iii)$$ and $$(iv)$$
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