60 ml 1M CH3COOH is mixed with 20 ml 1 M NaOH then pH of resulting solution will be

(Ka = 1.8 X 10-5, log1.8 = 0.25)

1. 8.55

2. 4.95

3. 4.45

4. 7.45

Subtopic:  Buffer |
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In which solvent, solubility of AgCl is maximum ?

1. 0.01 M NaCl

2. Pure Water

3. 0.01 M NH4OH

4. 0.05 M AgNO3

Subtopic:  Solubility Product |
 52%
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KpKc for the gaseous reaction:

I. 2A + 3B 2C
II. 2A4B
III. A+B+2C 4D

Would be respectively:

1. (RT)-3, (RT)2, (RT)0 

2. (RT)-3, (RT)-2, (RT)-1 

3. (RT)-3, (RT)2, (RT) 

4. None of the above

Subtopic:  Kp, Kc & Factors Affecting them |
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N2O4 dissociates as N2O4(g)2NO2(g) at 273 K and 2 atm pressure. The equilibrium mixture has a vapour density of 41. What will be the percentage degree of dissociation ?

1. 14.2%

2. 16.2%

3. 12.2%

4. 87.8%

Subtopic:  Introduction To Equilibrium |
 56%
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Inert gas is added to the equilibrium PCl5(g⇌ PCl3(g) + Cl2(g) at constant pressure. The degree of dissociation will :

1. Remain unchanged

2. Decrease

3. Increase

4. Decrease or increase but cannot be predicted with certainty

Subtopic:  Le Chatelier's principle |
 66%
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Dissociation of phosphorus pentachloride is favoured by:

1. High temperature and high pressure

2. High temperature and low pressure

3. Low temperature and low pressure

4. Low temperature and high pressure

Subtopic:  Le Chatelier's principle |
 70%
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N2O42NO2, Kc=4. This reversible reaction is studied graphically as shown in figure. Select the correct statement out of I, II and III.

I. Reaction quotient has maximum value at point A

II. Reaction proceeds left to right at a point when

     [N2O4]=[NO2]=0.1M

III. Kc=Q where point E or G is reached

1. I,II

2. II,III

3. I,III

4. I,II,III

Subtopic:  Introduction To Equilibrium |
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The stability product constant Ksp of Mg(OH)2 is 9.0 X 10-12. If a solution is 0.010 M with respect to Mg2+ ion, what is the maximum hydroxide ion concentration which could be present without causing the precipitation of Mg(OH)2 ?

1. 1.5 X 10-7 M

2. 3.0 X 10-7 M

3. 1.5 X 10-5 M

4. 3.0 X 10-5 M

Subtopic:  Solubility Product |
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The amount of CaC2O4 (molecular weight =128) will dissolve in distilled water to make 1 liter of a saturated solution is: 

[Ksp (CaC2O4) = 2.5 x 10-9 ]

1. 0.0064 g             
2. 0.1280 g
3. 0.0128 g           
4. 1.2800 g

Subtopic:  Solubility Product |
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What substance could be added to one liter of water to serve as a buffer?

1. One mole of CH3CO2H and 0.5 moles of NaOH

2. One mole of NH4Cl and one mole of HCl

3. One mole of NH4OH and one mole of NaOH

4. One mole of CH3CO2H and one mole of HCl

Subtopic:  Buffer |
 65%
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