1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Which one of the following species does not exist under normal conditions?
A
Be2+
B
Be2
C
B2
D
Li2
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is $$\Delta $$H (both of these in kJ/mol). Minimum value of Ea will be
A
less than $$\Delta $$H
B
equal to $$\Delta $$H
C
more than $$\Delta $$H
D
equal to zero
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K$$-$$1 mol$$-$$1 respectively. For the reaction

1/2X2 + 3/2Y2 $$\rightleftharpoons$$ XY3, $$\Delta $$H = $$-$$ 30 kJ,

to be at equilibrium, the temperature should be
A
750 K
B
1000 K
C
1250 K
D
500 K
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? Ka for CH3COOH = 1.8 $$ \times $$ 10$$-$$5
A
3.5 $$ \times $$ 10$$-$$4
B
1.1 $$ \times $$ 10$$-$$5
C
1.8 $$ \times $$ 10$$-$$5
D
9.0 $$ \times $$ 10$$-$$6