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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NEET 2023 - Target Batch - Aryan Raj Singh

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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NEET 2023 - Target Batch - Aryan Raj Singh

The equilibrium constant for the reaction 

NH4NO2(s) N2(g) + 2H2O(g) is given by

(1) [N2][H2O][NH4NO2]

(2) [N2][H2O]2

(3) [H2O][NH4NO2]

(4) [N2][NH4NO2]

 

Subtopic:  Kp, Kc & Factors Affecting them |
 85%
From NCERT
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Two flasks A and B of equal volume containing 1 mole and 2 mole of O3 respectively, are heated to the sametemperature. When the reaction 2O3 3O2 practically stops, then both the flasks shall have

(1) the same ratio [O2] /[O3]

(2) the same ratio : [O2]3/2/[O3]

(3) only O2

(4) the same time to reach equilibrium

Subtopic:  Kp, Kc & Factors Affecting them |
 69%
From NCERT
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A 10L container at 300K contains CO2 gas at pressure of 0.2 atm and an excess solid CaO (neglect thevolume of solid CaO). The volume of container is now decreased by moving the movable piston fitted in the container. What will be the maximum volume of container when pressure of CO2 attains its maximum value given that CaCO3 (s) CaO(s) + CO2(g)Kph = 0.800 atm

1. 5 L

2. 2.5 L

3. 1 L

4. The information is insufficient.

Subtopic:  Kp, Kc & Factors Affecting them |
 78%
From NCERT
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An equilibrium mixture at 700 K of 0.50 M N2, 3.00 M H2 and 2.00 M NH3 is present in a container. Now if this equilibrium is disturbed by adding N2 so that its concentration becomes 1.50 M just after addition then which of the following graphs represents the above situation more appropriately –

(1)

(2)

(3)

(4)

Subtopic:  Introduction To Equilibrium |
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