1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
In which of the following arrangements, the sequence is not strictly according to the property written against it
A
CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
B
HF < HCl < HBr, HI : increasing acid strength
C
NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
D
B < C < O < N : increasing first ionization enthalpy
2
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Using MO theory, predict which of the following species has the shortest bond length?
A
$$O_2^+$$
B
$$O_2^-$$
C
$$O_2^{2-}$$
D
$$O_2^{2+}$$
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
On the basis of the following thermochemical data :
($$\Delta _fG^oH^+_{(aq)}$$ = 0)

H2O(l) $$\to$$ H+(aq) + OH-(aq); $$\Delta H$$ = 57.32 kJ
H2(g) + $${1 \over 2} O_2(g) \to$$ H2O(l); $$\Delta H$$ = -286.20 kJ

The value of enthalpy of formation of OH ion at 25oC is :
A
-22.88 kJ
B
-228.88 kJ
C
+228.88 kJ
D
-343.52 kJ
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Solid Ba(NO3)2 is gradually dissolved in a 1.0 $$\times$$ 10-4 M Na2CO3 solution. At what concentration of Ba2+ will a precipitate begin to form ?
(Ksp for BaCO3 = 5.1 $$\times$$ 10−9 )
A
5.1 $$\times$$ 10-5 M
B
8.1 $$\times$$ 10-8 M
C
8.1 $$\times$$ 10-7 M
D
4.1 $$\times$$ 10-5 M
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