For the reversible system PCl3+Cl2PCl5, the relationship between degree of dissociation (α) of PCl5 and the equilibrium constant Kp of the above equilibrium is

1. KpP+Kp

2. Kp1+P.Kp

3. 1P+Kp

4. 11+P.Kp

Subtopic:  Kp, Kc & Factors Affecting them |
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One mole of N2O4(g) at 300 K is kept in a closed container under one atmospheric pressure. It is heated to 600 K when 20% by mass of N2O4(g) decomposes to NO2(g). The resultant pressure is

1. 1.0 atm

2. 2.4 atm

3. 2.0 atm

4. 1.2 atm

Subtopic:  Kp, Kc & Factors Affecting them |
 52%
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The equilibrium constant (K) of the reaction, A+BC+D at 298 K is 100. If the rate constant of the forward reaction is 4×105, the rate constant of the reverse reaction is

1. 4

2. 4×102

3. 4×103

4. 4×105

Subtopic:  Kp, Kc & Factors Affecting them |
 83%
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One mole of N2O4(g) at 310 K is 25% dissociated at 1 atm pressure. The percentage dissociation at 0.1 atm and 310 K is

1. 25%

2. 50%

3. 76%

4. 63%

Subtopic:  Kp, Kc & Factors Affecting them |
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Kp has the value of 10-6 atm3 and 10-4 atm3 at 298 K and 323 K respectively for the reaction

CuSO4.3H2O(s)CuSO4(s)+3H2O(g)
rH° for the reaction is:

1. 7.7 kJ/mol

2. -147.41 kJ/mol

3. 147.41 kJ/mol

4. None of these

Subtopic:  Kp, Kc & Factors Affecting them |
 64%
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Assume that the decomposition of HNO3 can be represented by the following equation

4HNO3(g)4NO2(g)+2H2O(g)+O2(g)

and the reaction approaches equilibrium at 400K temperature and 30 atm pressure. At equilibrium, partial pressure of HNO3 is 2 atm. Calculate Kc in (mol/L)3 at 400 K:

(Use : R=0.08 atm-L/mol-K)

1. 4

2. 8

3. 16

4. 32

Subtopic:  Kp, Kc & Factors Affecting them |
 51%
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A 250 ml flask containing NO(g) at 0.46 atm is connected to a 100 ml flask containing oxygen gas at 0.86 atm by means of a stop cock at 350 K, the gases are mixed by opening the stop cock where the following equilibrium is established.

2NOg+O22NO2gN2O4g

The first reaction is complete while the second is at equilibrium. If thetotal pressure is 0.37 atm, Kp is

1. 0.645 atm-1 

2. 1.290 atm-1 

3. 20 atm-1 

4. 5.46 atm-1 

Subtopic:  Kp, Kc & Factors Affecting them |
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The equilibrium constant for the reactions

N2+3H22NH3 and 12N2+32H2NH3

are K1 and K2 respectively. The correct relationship between K1 and K2 is

1. K1=K22

2. K2=K1

3. K2=K12

4. K1=K2

Subtopic:  Kp, Kc & Factors Affecting them |
 81%
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One mole of N2(g) is mixed with 2 moles of H2(g) in a 4 litre vessel. If 50% of N2(g) is converted to NH3(g) by the following reaction:

N2(g)+3H2(g)2NH3(g)

What will be the value of Kc for the following equilibrium?

NH3(g)12N2(g)+32H2(g)

1. 256

2. 16

3. 116

4. None of these

Subtopic:  Le Chatelier's principle |
 63%
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If pKa=-log Ka=4 and Ka=Cx2 then Van't Hoff factor of weak monobasic acid when C=0.01 M is

1. 1.02

2. 1.01

3. 1.20

4. 1.10

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 52%
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