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Q.

Five solutions A, B, C, D and E when tested with universal indicators showed pH 4, 1, 11,7 and 9 respectively. Which of the following solutions is weakly alkaline?


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a

A

b

B

c

E

d

D 

answer is C.

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Detailed Solution

Solution E is weakly alkaline because its pH is 9.
An aqueous solution's basic or acidic levels are measured using a scale called pH. pH scale readings range from 0 to 14. Acidic compounds are those with a pH of less than 7, whereas basic substances are those with a pH of more than 7. 9 is more than 7. Bases having pH between 7-10 are weak. Therefore, the solution which showed pH 9 is weakly alkaline in nature.
 
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