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Rohan prepared a solution by dissolving 35 g of sodium chloride in 100 g of water. He added 10 g more sodium chloride to this solution and evaporated 20 g of water by heating. Radhika prepared another solution by dissolving 15 g of sodium chloride in 50 g of water and made the mass of solution 100 g. Mohan took 20 g of the final solution prepared by Rohan and 30 g from Radhika’s solution. The concentration (w/w) of the solution prepared by Mohan will be

रोहन ने 100 g जल में 35 g सोडियम क्लोराइड को घोलकर एक विलयन बनाया। उसने इस विलयन में 10 g और सोडियम क्लोराइड मिलाया तथा गर्म करके 20 g जल को वाष्पीकृत किया। राधिका ने 50 g जल में 15 g सोडियम क्लोराइड को घोलकर अन्य विलयन बनाया तथा विलयन का द्रव्यमान 100 g बनाया। मोहन ने रोहन द्वारा बनाये गये अंतिम विलयन का 20 g तथा राधिका द्वारा बनाये गये विलयन का 30 g लिया। मोहन द्वारा बनाये गये विलयन की सान्द्रता (w/w) होगी

A
26.8%
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B
23.4%
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C
32.4%
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D
28.7%
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Solution

The correct option is B 23.4%

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