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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The dissociation equilibrium of a gas AB2 can be represented as 
 2AB2(g)  2AB(g) + B2(g) 
The degree of dissociation is ‘x’ and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is:
1. (2KP/p)
2. (2Kp /p)1/3
3. (2KP/p)1/2
4. (KP/P)

Subtopic:  Kp, Kc & Factors Affecting them |
 69%
From NCERT
AIPMT - 2008
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The value of KP1 and Kp2 for the reactions
 X  Y +Z ......(i)
and A 2B ......(ii)
are in the ratio of 9 : 1. If the degree of dissociation of X and A is equal, then the total pressure at equilibrium(i) and (ii) are in the ratio:

1. 3 : 1

2. 1 : 9

3. 36 : 1

4. 1 : 1

Subtopic:  Kp, Kc & Factors Affecting them |
 62%
From NCERT
AIPMT - 2008
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The following equilibrium constants are given: 
N2 + 3H2 ⇌ 2NH3K1 
N2 + O⇌ 2NO; K2 
H2 + 1/2O2 ⇌ H2O; K3 

The equilibrium constant for the oxidation of NH3 by oxygen to give NO is:

1. K2K33/K1

2. K2K32/K1

3. K22K3/K1

4. K1K2/K3 

Subtopic:  Kp, Kc & Factors Affecting them |
 68%
From NCERT
AIPMT - 2007
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Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. HOCl<HOClO<HOClO2<HOClO3

2. HOClO<HOCl<HOClO3<HOClO2

3. HOClO2<HOClO3<HOClO<HOCl

4. HOClO3<HOClO2<HOClO<HOCl

Subtopic:  Acids & Bases - Definitions & Classification |
 87%
From NCERT
AIPMT - 2007
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The following pair constitutes a buffer is:

1. HNO2 and NaNO2

2. NaOH and NaCl

3. HNO3 and NH4NO3

4. HCl and KCl

Subtopic:  Buffer |
 66%
From NCERT
AIPMT - 2006
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