The pH of blood is maintained by CO2 by and H2CO3 in the body and chemical constituents of blood. This phenomenon is called:

1. colloidal                           

2. buffer action

3. acidic                               

4. salt balance

Subtopic:  Buffer |
 93%
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Incorrect statement among the following is: 

1. Addition of one drop of concentrated HCl in NH4OH solution decreases pH of the solution.

2. A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7

3. pH of pure neutral water is not zero.

4. A cold and concentrated H2SO4 has lower H+ ion concentration than a dilute solution of H2SO4 

Subtopic:  pH calculation |
From NCERT
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At temperature T, a compound AB2 (g) dissociates according to the reaction 2AB22AB(g) +B2(g) with a degree of  dissociation x, which is small compared with unity. The expression for Kp, in terms of x and the total pressure P , is:

1. Px3/2                                 

2. Px2/3

3. Px3/3                                 

4. Px2/2

Subtopic:  Kp, Kc & Factors Affecting them |
 61%
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The rate constants for forward and backward reaction of hydrolysis is ester are 1.1 x10-2 and 1.5x10-3 per minute. Equilibrium constant for the reaction,                                                              

 CH3COOC2H5 + H+  CH3COOH + C2H5OH is

1. 4.33           

2. 5.33           

3. 6.33         

4. 7.33

Subtopic:  Introduction To Equilibrium |
 78%
From NCERT
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What happens to pH of a solution when NH4Cl crystal is added to a dilute solution of NH4OH?

1. Decreases                                   

2. Increases

3. Remains unaffected                       

4. All of the above

Subtopic:  pH calculation |
 52%
From NCERT
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For the reactions,

 B;                                  Kc = 2

 C;                                  Kc = 4

 D;                                  Kc = 6

Kc for the reaction, A  D is:

1. (2+4+6)                       

2. (2x4)/6

3. (4x6)/2                         

4. 2x4x6

Subtopic:  Introduction To Equilibrium |
 83%
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The phenomenon of interaction of anions and cations furnished by an electrolyte with the H+ and  OH- ions of water to produce acidic nature or alkalinity is known as hydrolysis. In hydrolysis:

1. the pH may either increase or decrease

2. all the salts (except those made up with strong acid and base) undergo hydrolysis

3. the variation of pH depends upon the nature of salts as well as on the temperature

4. all of the above

Subtopic:  pH calculation |
 86%
From NCERT
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For the reaction equilibrium,

2NOBr(g) 2NO(g) + Br2, if PBr2 = P/9 at equilibrium and P is total pressure. The ratio of Kp/P is equal to:

1. 1/9               

2. 1/81

3. 1/27               

4. 1/3

Subtopic:  Introduction To Equilibrium |
 67%
From NCERT
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In the system, CaF2(s) Ca2+ (aq) + 2F-(aq), increasing the concentration of Ca2+ ions 4 times will cause the equilibrium concentration of F- ions to change to:

1. 1/4 of the initial value

2. 1/2 of the initial value

3. 2 times of the initial value

4. none of the above

Subtopic:  Kp, Kc & Factors Affecting them |
 72%
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The addition of HCl does not suppress the ionization of:

1. Acetic acid 2. Benzoic acid
3. H2S 4. H2SO4
Subtopic:  Common Ion Effect |
 60%
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