Among the following pairs of solution the one which is not an acidic buffer is 

1. HClO4 and NaClO4

2. CH3COOH and CH3COONa

3. H2CO3 and Na2CO3

4. H3PO4 and Na3PO4

Subtopic:  Buffer |
 62%
From NCERT
NEET - 2015
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For the reversible reaction, N2(g) + 3H2(g) — 2NH3(g) + Heat the equilibrium shifts in

forward direction

1. By increasing the concentration of NH3(g)

2. By decreasing the pressure

3. By decreasing the concentrations of N2(g) and H2(g)

4. By increasing pressure and decreasing temperature

Subtopic:  Le Chatelier's principle |
 80%
From NCERT
NEET - 2014
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For a given exothermic reaction, Kp and K'p are the equilibrium constants at temperatures

T1 and T2 respectively. Assuming that heat of reaction is constant in a temperature range

between T1 and T2, it is readily observed that

1. Kp>K'p                       

2. Kp<K'p

3. Kp = K'p                     

4. Kp = 1/K'p

Subtopic:  Kp, Kc & Factors Affecting them |
NEET - 2014
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Buffer solutions have constant acidity and alkalinity because
1. these give unionised acid or base or base on reaction with added acid or alkali
2. acids and alkalies in these solutions are shielded from attack by other ions
3. they have large excess of H+ or OH- ions
4. they have fixed value of pH

 

Subtopic:  Buffer |
 56%
From NCERT
NEET - 2012
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The molecule that is least likely to behave as Lewis base is: 

1. NH3

2. BF3

3. OH-

4. H2O

Subtopic:  Ionisation Constant of Acid, Base & Salt | Acids & Bases - Definitions & Classification |
 79%
From NCERT
NEET - 2011
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Kc and Kp are not equal for a reaction given below:

1. 2NO(g) N2(g) + O2(g)

2. SO2(g) + NO2(g) SO3(g) + NO(g)

3. H2(g) + I2(g) 2HI(g)

4. 2C(s) + O2(g) 2CO2(g)

Subtopic:  Kp, Kc & Factors Affecting them |
 88%
From NCERT
NEET - 2010
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Which one of the following molecular hydrides acts as a Lewis acid?

1. NH3         

2. H2O         

3. B2H6           

4. CH4

Subtopic:  Acids & Bases - Definitions & Classification |
 79%
From NCERT
NEET - 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 |
 82%
From NCERT
NEET - 2009
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The ionisation 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:  Kp, Kc & Factors Affecting them | Salt Hydrolysis & Titration |
 73%
NEET - 2009
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The oxide that is not expected to react with sodium hydroxide is : 

1. B2O3           

2. CaO

3. SiO2             

4. BeO

Subtopic:  Acids & Bases - Definitions & Classification |
 58%
From NCERT
NEET - 2009
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