For a hypothetical equilibrium:

4A + 5B          4x + 6y;
the equilibrium constant Kc has the unit:

1. mol2 litre-2

2. litre mol-1

3. litre2 mol-2

4. mol litre-1

Subtopic:  Kp, Kc & Factors Affecting them |
 82%
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Calculate the pOH of a solution at 25°C that contains 1x10-10 M of hydronium ion.        

1. 7.00                         

2. 4.00

3. 9.00                         

4. 1.00

Subtopic:  pH calculation |
 80%
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Solubility of MX2 type electrolytes is 0.5x10-4 mol/L, then the Ksp of electrolytes is :         

1. 5 x 10-12

2. 25 x 10-10

3. 1 x 10-13

4. 5 x 10-13

Subtopic:  Solubility Product |
 71%
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For which reaction does the equilibrium constant depend on the units of concentration?

1. NO (g) 12N2 (g) + 12O2 (g)

2. Zn (s) + Cu2+ (aq)  Cu(s) + Zn2+ (aq)

3. C2H5OH (l) + CH3COOH (l) CH3COOC2H5 (l) + H2O (l)

4. COCl2 (g)  CO(g) + Cl2 (g)

Subtopic:  Kp, Kc & Factors Affecting them |
 68%
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A physician wishes to prepare a buffer solution at pH=3.58 that efficiently resist changes in pH yet contains only small concetration of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use ?           [1997]

1. m-chlorobenzoic acid (pKa = 3.98)

2. p-chlorocinnamic acid (pKa = 4.41)

3. 2,5-dihydroxy benzoic acid (pKa = 2.97)

4. Acetoacetic acid (pKa = 3.58)

Subtopic:  Buffer |
 54%
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One mole of ethyl alcohol was treated with one mole of acetic acid at 25°C. 2/3 of the acid changes into ester at equilibrium. The equilibrium constant for the reaction will be:

1. 1                   

2. 2

3. 3                   

4. 4

Subtopic:  Introduction To Equilibrium |
 51%
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For a given solution pH = 6.9 at 60°C, where Kw=10-12. The solution is:

1. acidic                                         

2. basic

3. neutral                                         

4. unpredictable

Subtopic:  pH calculation |
 70%
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In a buffer solution containing equal concentration of B- and H B, the Kb for B- is 10-10. The pH of buffer solution is 

1. 10

2. 7

3. 6

4. 4

Subtopic:  Buffer |
 66%
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Aqueous solution of acetic acid contains                                                   

1. CH3COO- and H+

2. CH3COO-, H3O+ and CH3COOH

3. CH3COO-, H3O+ and H+

4. CH3COOH, CH3COO- and H+

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 58%
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The equilibrium, 2SO2 (g) + O2 (g2SO3 (g)

shifts forward if:

1. a catalyst is used

2. an absorbent is used to remove SO3 as soon as it is formed

3. small amounts of reactants are used

4. none of the above

Subtopic:  Le Chatelier's principle |
 78%
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