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INTEGER ANSWER TYPE
12. The oxidation number of Mn in the product of alkaline oxidative fusion of MnO2 is
Sol. 6.
Below is the reaction
2MnO2 + 4KOH + O2 --> 2K2MnO4 + 2H2O
(Potassium manganate)
O.S. of Mn = +6 in K2MnO4
13. The number of water molecule(s) directly bonded to the metal centre in CuSO4 . 5H2O is
Sol. 4.
Since Cu shows its secondary valency as 4.Therefore , total no. of ligands will be 4 in the complex.
CuSO4 . 5H2O --> [Cu(H2O)4]SO4 . H2O
So, water molecules directly attached to Cu are 4.
14. The coordination number of Al in the crystalline state of AlCl3 is
Sol. 6
Coordination number of Al is 6. It exists in ccp lattice with 6 coordinate layer structure.
15. In a constant volume calorimeter, 3.5 g of a gas with molecular weight 28 was burnt in excess oxygen at 298.0 K. The temperature of the calorimeter was found to increase form 298.0 K to 298.45 K due to the combustion process. Given that the heat capacity of the calorimeter is 2.5 kJ K-1, the numerical value for the enthalpy of combustion of the gas in kJ mol-1 is
Sol. 9
Energy release at constant volume due to combustion of 3.5 gm of a gas = 2.5 × 0.45
Hence energy released due to the combustion of 28 gm (i.e., 1 mole) of a gas = 2.5 × 0.45 × 28/3.5 = 9 kJ mol-1
16. The dissociation constant of a substituted benzoic acid at 25oC is 1.0 × 10-4. The pH of a 0.01 M solution of its sodium salt is
Sol. 8
Ka (C6H5COOH) = 1 × 10-4
pH of 0.01 M C6H5COONa
C6H5COO- + H2O -------> C6H5COOH + OH-1
0.01(1-h) 0.01 h 0.01 h
Kh = Kw/Ka =(0.01 h2)/(1-h) 10-14/10-4 = 10-2 h2/(1-h) (1 – h ≈ 1)
[OH-] = 0.01 h = 0.01 × 10-4 = 10-6
[H+] = 10-8
pH = 8
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