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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Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?
1. 1.11×10-4 M
2. 3.7×10-4 M
3. 3.7×10-3 M
4. 1.11×10-3 M

Subtopic:  pH calculation |
 65%
From NCERT
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 |
 61%
From NCERT
AIPMT - 2008
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The value of the equilibrium constant of the reaction 
 HI(g)  12H2(g) + 12I2 is 8.0.
The equilibrium constant of the reaction
 H2(g) + I2(g)  2HI(g) will be-

1. \(1 \over 16\) 2. \(1 \over 64\)
3. 16 4. \(1 \over 8\)
Subtopic:  Kp, Kc & Factors Affecting them |
 86%
From NCERT
AIPMT - 2008
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The pOH of a solution at 25 °C that contains 1×10-10 M of hydronium ions is:

1. 7.00 2. 4.00 
3. 9.00 4. 1.00
Subtopic:  pH calculation |
 80%
From NCERT
AIPMT - 2007
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A weak acid, HA, has a Ka of 1.00×10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to:

1. 99.0%

2. 1%

3. 99.9%

4. 0.100%

Subtopic:  Salt Hydrolysis & Titration |
 66%
From NCERT
AIPMT - 2007
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