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 |
 58%
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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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Solubility of a gas in liquid increases on:

1. Addition of a catalyst

2. Increasing the pressure

3. Decreasing the pressure

4. Increasing the temperature

Subtopic:  Le Chatelier's principle |
 71%
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A solution is called saturated if:

1. ionic concentration product < solubility product

2. ionic concentration product > solubility product

3. ionic concentration product  solubility product

4. none of the above

Subtopic:  Introduction To Equilibrium |
 59%
From NCERT
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The concentration of [H+] and concentration of [OH-] of a 0.1M aqueous solution of 2% ionised weak monobasic acid is                                                                    

[ionic product of water = 1x 10-14]

1. 0.02x10-3 M and 5x10-11 M

2. 1x10-3 M and 3x10-11 M

3. 2x10-3 M and 5x10-12 M

4. 3x10-2 M and 4x10-13 M

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 73%
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The relation for calculating pH of a weak base is:

1. pH =pKw -1/2 pKb + 1/2 logc

2. pH =pKw +1/2 pKb - 1/2 logc

3. pH =pKw -1/2 pKa + 1/2 logc

4. none of the above

Subtopic:  Salt Hydrolysis & Titration |
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Eight mole of a gas AB3 attain equilibrium in a closed container of volume 1 dm3 as,

2 AB3  A2(g) + 3B2(g). If at equilibrium 2 mole of A2 are present then, equilibrium constant is:

1. 72 mol2L-2                     

2. 36 mol2L-2 

3. 3 mol2L-2                       

4. 27 mol2L-2  

Subtopic:  Introduction To Equilibrium |
 63%
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Which is Lewis base?

1. HCl               

2. HNO3

3. HF               

4. NH3

Subtopic:  Acids & Bases - Definitions & Classification |
 87%
From NCERT
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