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 |
 74%
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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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In a closed container of 1 dm³, 8 moles of \(AB_3\)​ gas reach equilibrium following the reaction:
\(2 \mathrm{AB}_3(g) \rightleftharpoons \mathrm{~A}_2(g)+3 \mathrm{~B}_2(g)\)
What is the equilibrium constant when 2 moles of \(A_2\) are observed at equilibrium?

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%
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For a reversible reaction, if the concentrations of the reactants are doubled, the equilibrium constant will be                                                                                       

1. one-fourth                         

2. halved

3. doubled                             

4. the same

Subtopic:  Introduction To Equilibrium |
 68%
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The molecule that is least likely to act as a Lewis base is:     

1. CO         

2. \(F^{-}\)         

3. AlCl3      

4. PF3

Subtopic:  Acids & Bases - Definitions & Classification |
 67%
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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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