Aqueous solution of which salt has the lowest pH?

(1) NaOH                 

(2) NH4Cl

(3) Na2CO3               

(4) NaCl

Subtopic:  pH calculation |
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 The following equilibria are given

 N2 + 3H2  2NH3,      K1

N2 + O2  2NO,          K2

H212O2  H2O,       K3

The equilibrium constant of the reaction, 2NH352O2  2NO + 3H2O in terms of  K1, K2 and K3 is  

(1) K1K33/K2                         

(2) K2K33/K1

(3) K1K2K3                            

(4) K1K2/K3 

Subtopic:  Kp, Kc & Factors Affecting them |
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At a certain temperature, 2HI H2 +I2 only 50% HI is dissociated at equilibrium. The equilibrium constant is:

(a) 1.0                     (b) 3.0                 (c) 0.5               (d)   0.25

Subtopic:  Kp, Kc & Factors Affecting them |
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In the reaction, PCl5PCl3 + Cl2, the amounts of PCl5, PCl3 and Cl2 at equilibrium are 2 mole each and the total pressure is 3 atm. The equilibrium constant Kp is:

(a) 1.0 atm                                        (b) 2.0 atm

(c) 3.0 atm                                        (d) 6.0 atm

Subtopic:  Kp, Kc & Factors Affecting them |
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On addition of an inert gas at constant volume to the reaction, N2 + 3H22NH3 at  equilibrium:

(1) the reaction halts

(2) forward reaction is favoured

(3) the reaction remains unaffected

(4) backward reaction is favoured

Subtopic:  Le Chatelier's principle |
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In which of the following case reaction goes farthest to completion?

(1) K=103                                         

(2) K=10-2

(3) K=10                                           

(4) K=100

Subtopic:  Introduction To Equilibrium | Kp, Kc & Factors Affecting them |
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For the reversible reaction,

N2 (g) + 3H2(g) 2NH3 (g) + heat

 the equilibrium shifts in forward direction                                   

(1) by increasing the concentration of NH3 (g) 

(2) by decreasing the pressure

(3) by decreasing the concentrations of N2 (g)and H2(g)

(4) by increasing pressure and decreassing temperature

 

Subtopic:  Le Chatelier's principle |
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Which is the strongest acid in the following?          

(a) H2SO4            (b) HClO3        (c) HClO4         (d) H2SO3 

Subtopic:  Acids & Bases - Definitions & Classification |
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The conjugate acid of NH2- is                           

(a) N2H4      (b) NH4+       (c) NH4OH        (d) NH3

Subtopic:  Acids & Bases - Definitions & Classification |
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A 50 ml solution of strong acid of pH = 1 is mixed with a 50 ml solution of strong acid of pH=2. The pH of the mixture will be nearly:                                                     

(log 5.5 = 0.74)

1. 0.74                   2. 1.26

3. 1.76                   4.  1.5

Subtopic:  pH calculation |
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