1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is
A
SO2 < P2O3 < SiO2 < Al2O3
B
Al2O3 < SiO2 < P2O3 < SO2
C
Al2O3 < SiO2 < SO2 < P2O3
D
SiO2 < SO2 < Al2O3 < P2O3
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below

O(g) + e- = $$O_{(g)}^{-}$$ $$\Delta $$Ho = -142 kJmol-1

$$O_{(g)}^{-}$$ + e- = $$O_{(g)}^{2-}$$ $$\Delta $$Ho = 844 kJmol-1

This because
A
O- ion will tend to resist the addition of another electron
B
Oxygen has high electron affinity
C
Oxygen is more electronegative
D
O- ion has comparatively larger size than oxygen atom
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is
A
H2S < SiH4 < NH3 < BF3
B
H2S < NH3 < BF3 < SiH4
C
H2S < NH3 < SiH4 < BF3
D
NH3 < H2S < SiH4 < BF3
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species?
A
Bond length in NO+ is greater than in NO
B
Bond length is unpredictable
C
Bond length in NO+ in equal to that in NO
D
Bond length in NO is greater than in NO+
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