In the following reaction

HC2O4- + PO43- HPO42- + C2O42- 

Which are the two Bronsted bases ?

1. H2C2O4- and PO43-

2. HPO42- and C2O42-

3. H2C2O4- and HPO4-2

4. PO43- and C2O42-

Subtopic:  Ionisation Constant of Acid, Base & Salt | Acids & Bases - Definitions & Classification |
 69%
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Percentage ionisation of water at certain temperature is 3.6 X 10-7%, Calculate Kand pH of water.

1. 10-14, pH = 6.7

2. 4 X 10-14, pH=6.7

3. 2X 10-14, pH=7

4. 10-14, pH=7

Subtopic:  pH calculation |
 57%
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A 50 ml solution of strong acid of pH = 1 is mixed with a 50 ml solution of strong acid of pH=2. The pH of the mixture will be nearly:                                                     

(log 5.5 = 0.74)

1. 0.74                   

2. 1.26

3. 3.76                 

4. 4.50

Subtopic:  pH calculation |
 74%
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1 litre solution of pH =4 (solution of a strong acid) is added to the 7/3 litre of water. What is the pH of resulting solution. (Log 3 = 0.48)

1. 4

2. 4.48

3. 4.52

4. 5

Subtopic:  pH calculation |
 67%
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The pH of a solution obtained by mixing 50ml of 0.4N HCl and 50ml of 0.2M NaOH is:

1. 13

2. 12

3. 1.0

4. 2.0

Subtopic:  pH calculation |
 73%
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Kb for a monoacidic base whose 0.10 M solution has a pH of 10.48

1. 9 X 10-6

2. 9 X 10-9

3. 9 X 10-7

4. 3 X 10-7

Subtopic:  pH calculation |
 54%
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In an acidic Buffer solution (CH3COOH + CH3COONa), the species mainly present in the solution are:

(Ignore negligible amount)

1. CH3COOH, CH3COO-, CH3COONa, H+

2. CH3COO-, Na+, CH3COOH

3. CH3COONa, CH3COO-, H+

4. CH3COO-, Na+, H+, CH3COONa

Subtopic:  Common Ion Effect |
 53%
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When NH4Cl is added in NH4OH solution, then pH of the solution

1. Increases

2. Decreases

3. Remains unchanged

4. Firstly decreases and more than decreases

Subtopic:  Common Ion Effect |
 62%
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The most hydrolyzed salt among the following is-

(Assume that Kb of all weak bases is the same)
1. NH4Cl
2. CuSO4
3. AlCl3
4. All are equally hydrolyzed.

Subtopic:  Salt Hydrolysis & Titration |
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The pH of 10-6 M CH3COOH (Ka = 1.8 X 10-5) is:

1. 5.37

2. In between 6 & 7

3. 7

4. 8.63

Subtopic:  pH calculation |
 52%
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