1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
In which of the following pairs of molecules/ions, both the species are not likely to exist?
A
$$H_2^+$$ , $$He_2^{2-}$$
B
$$H_2^-$$ , $$He_2^{2-}$$
C
$$H_2^{2+}$$ , $$He_2$$
D
$$H_2^-$$ , $$He_2^{2+}$$
2
JEE Main 2013 (Offline)
MCQ (More than One Correct Answer)
+4
-1
Which one of the following molecules is expected to exhibit diamagnetic behaviour?
A
N2
B
O2
C
S2
D
C2
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:
A
– 5.1 eV
B
–10.2 eV
C
+ 2.55 eV
D
– 2.55 eV
4
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?
A
S < Se < Ca < Ba < Ar
B
Ba < Ca < Se < S < Ar
C
Ca < Ba < S < Se < Ar
D
Ca < S < Ba < Se < Ar
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