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 |
 53%
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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%
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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 |
 68%
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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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KMnO4 can be prepared from K2MnO4 as per reaction,

 3MnO42- + 2H2O  2MnO4- + MnO2 + 4OH-

The reaction can go to completion by removing OH- ions by adding             

1. HCl

2. KOH

3. CO2

4. SO2

Subtopic:  Introduction To Equilibrium |
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The rate of reaction depends upon the                    

1. Volume

2. Force

3. Pressure

4. Concentration of reactants

Subtopic:  Introduction To Equilibrium |
 87%
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The increasing order of basic strength of Cl-CO32- , CH3COO-, OH-, F- is:

1. Cl-<F-<CH3COO-<CO32- <OH-

2.  Cl-<F-CO32- <CH3COO-<OH-

3. CH3COO-<Cl-<F-<CO32- <OH-

4. none of the above

Subtopic:  Acids & Bases - Definitions & Classification |
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If the pressure is applied to the following equilibrium, Liquid  Vapour. The boiling temperature of the liquid:

1. will decrease                                 

2. will increase

3. may not change                           

4. will not change

Subtopic:  Introduction To Equilibrium |
 63%
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