Equilibrium

pH of water is 7 at 25 C. If water is heated to 80 C, it's pH will :

1. Decrease
2. Remains the same
3. Increase
4. H+ concentration increases, OH- concentration decreases

Consider the reaction X2Y(g) X2(g) + 12Y2(g) The equation representing correct relationship between the degree of dissociation (x) of X2Y(g) with its equilibrium constant Kp is . Assume x to be very very small.

1. x = [3] KpP
2. x = [3] Kp2P
3. x = [3] 2 Kp2P
4. x = [3] 2KpP

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of CO2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm, then Kp is :

1. 0.18 atm
2. 0.3 atm
3. 3 atm
4. 1.8 atm

The molar solubility(s) of zirconium phosphate with molecular formula ( Zr4+ )3 ( PO43- )4 is given by relation :

1. ( Ksp5348 )1/6
2. ( Ksp8435 )1/7
3. ( Ksp6912 )1/7
4. ( Ksp9612 )1/3

For a sparingly soluble salt AB2, the equilibrium concentrations of A2+ ions and B- ions are 1.2 10-4 M and 0.24 10-3 M, respectively. The solubility product of AB2 is :

1. 0.069 10-12
2. 0.276 10-12
3. 6.91 10-12
4. 27.65 10-12

For the given hypothetical reactions, the equilibrium constants are as follows : X Y; K1 = 1.0 Y Z; K2 = 2.0 Z W; K3 = 4.0 The equilibrium constant for the reaction X W is

1. 12.0
2. 8.0
3. 6.0
4. 7.0

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

1. Both Statement I and Statement II are false
2. Both Statement I and Statement II are true
3. Statement I is false but Statement II is true
4. Statement I is true but Statement II is false

At -20 and 1 atm pressure, a cylinder is filled with equal number of H2, I2 and HI molecules for the reaction H2(g) + I2(g) 2HI(g), the Kp for the process is x 10-1. x = . [Given : R = 0.082 L atm K-1 mol-1]

1. 2
2. 1
3. 10
4. 0.01

The ratio KpKC for the reaction : CO(g) + 12O2(g) CO2(g) is :

1. 1
2. (RT)1/2
3. RT
4. 1 RT

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

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

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