Equilibrium

The following reaction occurs in the Blast furnace where iron ore is reduced to iron metal Fe2O3(s) + 3CO(g) Fe(l) + 3CO2(g) Using the Le Chatelier's principle, predict which one of the following will not disturb the equilibrium.

1. Addition of CO2
2. Removal of CO
3. Addition of Fe2O3
4. Removal of CO2

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both Statement I and Statement II are correct
2. Statement I is incorrect but Statement II is correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

The equilibrium constant for the reaction SO3(g) SO2(g) + 12O2(g) is Kc = 4.9 10-2. The value of Kc for the reaction given below 2SO2(g) + O2(g) 2SO3(g) is :

1. 49
2. 416
3. 41.6
4. 4.9

Ka for CH3COOH is 1.8 10-5 and Kb for NH4OH is 1.8 10-5. The pH of ammonium acetate solution will be .

Solubility of calcium phosphate (molecular mass, M) in water is W g per 100 mL at 25 . Its solubility product at 25 will be approximately.

1. 107 ( WM )3
2. 103 ( WM )5
3. 107 ( WM )5
4. 105 ( WM )5

For the given reaction, choose the correct expression of KC from the following :- Fe3+(aq) + SCN-(aq) (FeSCN)2+(aq)

1. KC = [ Fe3+][SCN-][ FeSCN2+]
2. KC = [ FeSCN2+][ Fe3+][SCN-]
3. KC = [ FeSCN2+]2[ Fe3+][SCN-]
4. KC = [ FeSCN2+][ Fe3+]2[SCN-]2

A(g) B(g) + C2(g) The correct relationship between KP, and equilibrium pressure P is

1. KP = 1/2P3/2(2+ )3/2
2. KP = 3/2P1/2(2+ )1/2(1- )
3. KP = 1/2P1/2(2+ )3/2
4. KP = 1/2P1/2(2+ )1/2

The pH at which Mg(OH)2 [ Ksp = 1 10-11 ] begins to precipitate from a solution containing 0.10 M Mg2+ ions is .

The pH of an aqueous solution containing 1 M benzoic acid (pKa = 4.20) and 1 M sodium benzoate is 4.5. The volume of benzoic acid solution in 300 mL of this buffer solution is mL. (given : log 2 = 0.3)

For the reaction N2O4(g) 2NO2(g), Kp = 0.492 atm at 300 K. Kc for the reaction at same temperature is 10-2. (Given : R = 0.082 L atm mol-1 K-1)