1
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
2
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
3
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing 1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively :
A
200 and 300
B
300 and 400
C
400 and 600
D
500 and 600
4
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
In Cannizzaro reaction given below
2PhCHO $$\buildrel {\mathop {:OH}\limits^{\left( - \right)} } \over \longrightarrow $$ PhCH2OH + $$PhC\mathop O\limits^{..} $$2(-)
the slowest step is :
A
the transfer of hydride to the carbonyl group
B
the abstraction of proton from the carboxylic group
C
the attack of $$:\mathop {OH}\limits^{( - )} $$ at the carboxyl group
D
the deprotonation of Ph CH2OH
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