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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The dissociation constants for acetic acid and HCN at 25°C are 1.5 xl0-5 and 4.5 xl0-10,

respectively. The equilibrium constant for the equilibrium,

CN- + CH3COOH  =    HCN + CH3COO-   would be

1. 3.0 x 105

2. 3.0 x 10-5

3. 3.0x10-4

4. 3.0 x 104

Subtopic:  Ionisation Constant of Acid, Base & Salt |
From NCERT
NEET - 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 x 10-4 M             

2. 3.7 x 10-4 M

3. 3.7 x 10-3  M             

4. 1.11 x 10-3 M

Subtopic:  pH calculation |
 63%
NEET - 2008
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The value of equilibrium constant of the reaction HI (g)  12 H2(g) + 12 I2(g) is 8.0. The equilibrium constant of the reaction

H2(g) + I2(g) 2HI(g) will be

1. 1162. 1643. 164. 18

Subtopic:  Kp, Kc & Factors Affecting them |
 84%
From NCERT
NEET - 2008
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Which one of the following ionic species has the greatest proton affinity to form stable compound?

(1) HS-                         

(2) NH2-

(3) F-                           

(4) I-

Subtopic:  Acids & Bases - Definitions & Classification |
From NCERT
NEET - 2007
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For the reaction,

 CH4(g) + 2O2(g) CO2(g) + 2H2O (l),

 rH = -170.kJ mol-1

Which of the following statements is not true?

(a) At equilibrium, the concentrations of CO2(g) and H2O(l) are not equal

(b) The equilibrium constant for the reaction is given by Kp = [CO2]/[CH4][O2]

(c) Addition of CH4(g) or O2 (g) at equilibrium will cause a shift to the right

(d) The reaction is exothermic

Subtopic:  Kp, Kc & Factors Affecting them | Le Chatelier's principle |
 69%
From NCERT
NEET - 2006
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The hydrogen ion concentration of a 10-8 M HCl aqueous solution at 298 K (Kw = 10-14) is:

(1) 1.0×10-6 M

(2) 1.0525 x 10-7 M

(3) 9.525 x 10-8 M

(4) 1.0×10-8 M

Subtopic:  pH calculation |
 58%
From NCERT
NEET - 2006
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