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Q.

How much pure alcohol should be added to Question Image of strength Question Image of strength to make its strength Question Image to make its strength ?


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a

Question Image

b

Question Image

c

Question Image

d

Question Image 

answer is C.

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Detailed Solution

Concept- Here, we must determine how much pure alcohol should be added to the mixture in order to increase its strength over that of the original mixture. To start, we must determine the initial strength of the solution and the initial amount of alcohol present. We must use the initial quantity to determine the final amount of solution using the specified strength. The ratio or quantity stated as a fraction of 100 is called a percentage.
The amount of alcohol in Question Image solution of Question Image strength
Question ImageAllow the necessary quantity of alcohol to be added. Question Image.
It will result in a rise in solution volume Question Image.
Question Image The amount of alcohol now Question Imageand the amount of the solution Question Image.
Then, the strength Question ImageQuestion ImageQuestion ImageQuestion ImageHence, the correct answer is option 3.
 
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