Which oxide of nitrogen is the most stable?

1. 2NO2(g) N2(g) + 2O2(g);         K=6.7x1016 mol litre-1

2. 2NO(g) N2(g) + O2(g);            K=2.2x1030 mol litre-1

3. 2N2O5(g) 2N2(g) + 5O2(g);      K=1.2x1034 mol-5 litre-5

4. 2N2O(g) 2N2(g) + O2(g);         K=3.5x1033 mol litre-1

Subtopic:  Le Chatelier's principle |
 58%
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On adding A to the reaction at equilibrium,  AB(s)  A(g) + B(g), the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

1. 1/2 of its original value

2. 1/4 of it s original value

3. 1/8 of its original value

4. twice of its original value

Subtopic:  Introduction To Equilibrium |
 75%
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2 mole of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium 40% of PCl5 dissociated into PCl3 and Cl2. The value of the equilibrium constant is :

1. 0.267

2. 0.53

3. 2.63

4. 5.3

Subtopic:  Kp, Kc & Factors Affecting them |
 61%
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Given, HF + H2OKaH3O+ + F-

          F- + H2KbHF + OH-

which relation is correct?

1. Kb =Kw                       

2. Kb =1/Kw 

3. Ka x Kb =Kw                 

4.  Ka/Kb = Kw 

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 79%
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The value sf Kp1 and Kp2 for the reactions

              XY+Z                                          ....(1)

   and      A2B                                          ......(2)

are in the ratio 9:1. If the degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio:

1. 1:9                                     

2. 36:1

3. 1:1                                     

4. 3:1

Subtopic:  Kp, Kc & Factors Affecting them |
 78%
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The relation for calculating pH of a solution containing weak acid and its salt is:

1. pH = pKa + log[Conjugate Base][Acid]

2. pH = pKa - log[Conjugate Base][Acid]

3. pH = pKa + log[Conjugate Base][Salt]

4. pOH = pKa - log[Acid][Conjugate Base]

Subtopic:  Introduction To Equilibrium |
 70%
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The equilibrium constants for the reaction,

A2 2A at 500 K and 700 K are 1x10-10 and 1x10-5. The given reaction is                  

(a) exothermic                    (b) slow

(c) endothermic                  (d) fast

1. a,b

2.c,b

3.a,d

4 c,d

Subtopic:  Introduction To Equilibrium |
 50%
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For the chemical reaction, 3X(g) + Y(g) X3Y(g) ;

the amount of X3Y at equilibrium is affected by :

1. Temperature and pressure

2. Temperature only

3. Pressure only

4. Temperature, pressure and catalyst

Subtopic:  Le Chatelier's principle |
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H2S gas when passed through a solution of cations containing HCl precipitates the cations of the second group in qualitative analysis but not those belonging to the fourth group. It is because: 
 

1. Presence of HCl decreases the sulphide ion concentration
2. Presence of HCl increases the sulphide ion concentration
3. Solubility product of group II sulphides is more than that of group IV sulphides
4. Sulphides of group IV cations are unstable in HCl


        

Subtopic:  Common Ion Effect |
 50%
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The equilibrium constant Br2 2Br at 500 K and 700 K are 10-10 and 10-5 respectively. The reaction is:

(a) endothermic                                  (b) exothermic

(c) fast                                               (d) slow

 

1. a,b

2.c,b

3.a,d

4 c,d

Subtopic:  Kp, Kc & Factors Affecting them |
 71%
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