RRB NTPC CBT-1 previous year question
A solution is prepared by dissolving 15 g of salt in 585 g of water. Calculate the mass percent (w/w) of the solution.
Asked in RRB NTPC 2026 — 14 June Shift 2 · General Awareness
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Correct answer: (A) 2.5%
Mass percent (w/w) = mass of solute / total mass of solution * 100 = 15/(15+585)*100 = 15/600*100 = 2.5%.
हिंदी में प्रश्न
15 g लवण को 585 ५ जल में घोलकर एक विलयन तैयार किया जाता है। विलयन के द्रव्यमान प्रतिशत (wiw) की गणना काजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 2.1%
द्रव्यमान प्रतिशत (w/w) = विलेय का द्रव्यमान / विलयन का कुल द्रव्यमान * 100 = 15/(15+585)*100 = 15/600*100 = 2.5% है।
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