Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?
1. BaCl2
2. AlCl3
3. LiCl
4. BeCl2

Subtopic:  pH calculation |
 56%
From NCERT
AIPMT - 2012
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A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of  NH4is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8×10-5, then what is the pH of this solution? 
(log 1.8 = 0.25; log 0.67 = -0.176)

1.  9.43
2.  11.72
3.  8.73
4.  9.08

Subtopic:  Buffer |
 64%
From NCERT
AIPMT - 2011
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The equilibrium reaction that doesn't have equal values for Kc and Kis: 

1. \(2NO(g) \rightleftharpoons N_2(g) + O_2(g)\)
2. \(SO_2(g) + NO_2(g) \rightleftharpoons SO_3(g) + NO(g)\)
3. \(H_2(g) + I_2(g) \rightleftharpoons 2HI (g)\)
4. \(2C(s) + O_2(g) \rightleftharpoons 2CO_2(g)\)

Subtopic:  Kp, Kc & Factors Affecting them |
 90%
From NCERT
AIPMT - 2010
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Which of the following molecular hydrides acts as a Lewis acid?

1. NH3

2. H2O

3. B2H6

4. CH4

Subtopic:  Acids & Bases - Definitions & Classification |
 83%
From NCERT
AIPMT - 2010
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The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence:

1. BCl3>BF3>BBr3

2. BBr3>BCl3>BF3

3. BBr3>BF3>BCl3

4. BF3>BCl3>BBr3

Subtopic:  Acids & Bases - Definitions & Classification |
 67%
From NCERT
AIPMT - 2010
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Which of the following molecules acts as a Lewis acid?
1. (CH3)3B
2. (CH3)2O
3. (CH3)3P
4. (CH3)3N
Subtopic:  Acids & Bases - Definitions & Classification |
 85%
From NCERT
AIPMT - 2009
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The ionization constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium Chloride is:

1. 5.65 x 10-10

2. 6.50 x 10-12

3. 5.65 x 10-13

4. 5.65 x 10-12

Subtopic:  Salt Hydrolysis & Titration |
 73%
From NCERT
AIPMT - 2009
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What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?

1. 0.10 M

2. 0.40 M

3. 0.0050 M

4. 0.12 M

Subtopic:  pH calculation |
 62%
From NCERT
AIPMT - 2009
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The dissociation constants for acetic acid and HCN at 25 °C are 1.5 x 10-5 and 4.5 x 10-10, respectively. The equilibrium constant for the equilibrium, 
CN- + CH3COOH  ⇌  HCN + CH3COO- 
would be:
1. 3.0×105
2. 3.0×10-5
3. 3.0×10-4
4. 3.0×104

Subtopic:  Kp, Kc & Factors Affecting them |
From NCERT
AIPMT - 2009
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If the concentration of OH ' ions in the reaction 

Fe(OH)3(s)   Fe3+(aq) + 3OH-(aq)is 
decreased by 14 times, then the equilibrium concentration of Fe3+ will increase by:

1. 8 times

2. 16 times

3. 64 times

4. 4 times

Subtopic:  Introduction To Equilibrium |
 80%
AIPMT - 2008
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