1
IIT-JEE 2010 Paper 2 Offline
MCQ (Single Correct Answer)
+2
-0.5
Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is
A
1 and diamagnetic
B
0 and diamagnetic
C
1 and paramagnetic
D
0 and paramagnetic
2
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-0

Match each of the diatomic molecules in Column I with its property/properties in Column II:

Column I Column II
(A) $${B_2}$$ (P) Paramagnetic
(B) $${N_2}$$ (Q) Undergoes oxidation
(C) $$O_2^ - $$ (R) Undergoes reduction
(D) $${O_2}$$ (S) Bond order $$\ge$$ 2
(T) Mixing of $$s$$ and $$p$$ orbitals

A
$$\mathrm{(A)\to(P),(Q),(R),(T);(B)\to(S),(T);(C)\to(P),(Q);(D)\to(P),(Q),(S)}$$
B
$$\mathrm{(A)\to(P),(S),(R),(T);(B)\to(S),(T);(C)\to(P),(Q);(D)\to(P),(T),(S)}$$
C
$$\mathrm{(A)\to(Q),(R),(T);(B)\to(P),(T);(C)\to(P),(Q);(D)\to(T),(Q),(S)}$$
D
$$\mathrm{(A)\to(P),(R),(T);(B)\to(Q),(T);(C)\to(S),(Q);(D)\to(P),(Q),(S)}$$
3
IIT-JEE 2007
MCQ (Single Correct Answer)
+2
-0.5
Among the following the paramagnetic compound is
A
Na2O2
B
O3
C
N2O
D
KO2
4
IIT-JEE 2007
MCQ (Single Correct Answer)
+2
-0.5
The species having bond order different from that in CO is
A
NO-
B
NO+
C
CN-
D
N2
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