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-

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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

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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. 1.76                   4.  1.5

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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

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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

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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

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In an acidic Buffer solution (CH3COOH + CH3COONa), the species mainly present in the solution (Ignore negligible amount)

(1) CH3COOH, CH3COO-, CH3COONa,H+

(2) CH3COO-, Na+, CH3COOH

(3) CH3COONa, CH3COO-, H+

(4) CH3COO-, Na+, H+, CH3COONa

Concept Questions :-

Common Ion Effect
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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

Concept Questions :-

Common Ion Effect
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Which salt is more hydrolysed ?

(Assume that Kb of all weak base is same)

1. NH4Cl

2. CuSO4

3. AlCl3

4. All are equally hydrolysed

Concept Questions :-

Salt Hydrolysis
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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

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