1
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
The standard enthalpy of formation of NH3 is –46.0 kJ mol–1. If the enthalpy of formation of H2 from its atoms is –436 kJ mol–1 and that of N2 is –712 kJ mol–1, the average bond enthalpy of N–H bond in NH3 is :
A
–964 kJ mol–1
B
+352 kJ mol–1
C
+ 1056 kJ mol–1
D
–1102 kJ mol–1
2
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
For a particular reversible reaction at temperature T, ∆H and ∆S were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when :
A
Te > T
B
T > Te
C
Te is 5 times T
D
T = Te
3
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Three reactions involving $$H_2PO_4^−$$ are given below :

(i) H3PO4 + H2O $$\to$$ H3O+ + $$H_2PO_4^−$$

(ii) $$H_2PO_4^−$$ + H2O $$\to$$ $$HPO_4^{2−}$$ + H3O+

(iii) $$H_2PO_4^−$$ + OH- $$\to$$H3PO4 + O2-

In which of the above does $$H_2PO_4^−$$ act as an acid?
A
(ii) only
B
(i) and (ii)
C
(iii) only
D
(i) only
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
At 25°C, the solubility product of Mg(OH)2 is 1.0 $$\times$$ 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions?
A
9
B
10
C
11
D
8
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