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Question

Saloni prepared a solution by mixing 35 mL of ethanol in 200 mL of water. She divided the solution in two equal parts. To one part, she added some more ethanol so that the concentration of this new solution becomes 20% (v/v). The extra volume of ethanol added by Saloni is (approximately)

सलोनी ने 200 mL जल में 35 mL एथेनॉल को मिलाकर एक विलयन बनाया। उसने विलयन को दो समान भागों में विभाजित किया। एक भाग में उसने कुछ और एथेनॉल मिलाया जिससे इस नये विलयन की सान्द्रता 20% (v/v) हो जाती है। सलोनी द्वारा मिलाये गये एथेनॉल का अतिरिक्त आयतन (लगभग) है

A
3.12 mL
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B
6.38 mL
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C
7.82 mL
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D
7.50 mL
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Solution

The correct option is D 7.50 mL
Solution

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