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Q.

Three unknown solutions are given with pH value of 6, 8 & 9.5 respectively. Which solution will contain the maximum OH ion? 

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a

Solution sample-1 

b

Data is insufficient 

c

Solution sample-3 

d

Solution sample-2 

answer is C.

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Detailed Solution

The solution that contains that most H+ ions contains the least OH- ions and the solution that contains least H+ ions contains most OH- ions. 

For finding the compound with maximum OH- ions, we need to find the compound with least H+ ions. 

For pH= 6, H+ concentration 

Question Image

 

For pH= 8, H+ concentration 

Question Image

 

For pH = 9.5 , H+ concentration 

Question Image

 

Clearly, pH= 9.5 has the least H+ concentration. Moreover, it is basic in nature. 

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