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 |
 54%
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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 |
 57%
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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 |
 75%
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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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Acoording to Bronsted-Lowry concept, the correct order of relative strength of bases follows the order

1. CH3COO- > Cl- > OH-

2. CH3COO- > OH- > Cl-

3. OH> CH3COO- > Cl-

4. OH- > Cl-> CH3COO-

 

Subtopic:  Acids & Bases - Definitions & Classification |
 59%
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pOH of H2O is 7.0 at 298K. If water is heated at 350K, which of the following statement should be true ?

(1) pOH will decrease

(2) pOH will increase

(3) pOH will remain 7.0

(4) Concentration of H+ ions will increase but that of OH- will decrease.

Subtopic:  pH calculation |
 57%
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In which case following equilibrium can't be established:

CaCO3(s) CaO(s) + CO2(g)

1. Some CaO & pressure of CO2 was greater than Kp

2. Pure CaCO3

3. Some CaCO3 & pressure of CO2 gas greater than Kp

4. Some CaCO3 & pressure of CO2 gas less than Kp.

Subtopic:  Kp, Kc & Factors Affecting them |
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