Question

3. किसी परीक्षा में 60% छात्र उत्तीर्ण हुए, 10% ने पूरक प्राप्त किया जिनमें से 30 ही पूरक परीक्षा में सम्मिलित
हुए जो पूरक प्राप्त करने वालों का 25% थे। ज्ञात कीजिए :
(i) परीक्षा में सम्मिलित कुल छात्रों की संख्या,
(ii) उत्तीर्ण छात्रों की संख्या, (iii) अनुत्तीर्ण छात्रों की संख्या।
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Answer 1

• $\huge\red{\mid{\fbox{\tt(answer)}\mid}}$An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl−(aq). The word aqueous (which comes from aqua) means pertaining to, related to, similar to, or dissolved in, water. As water is an excellent solvent and is also naturally abundant, it is a ubiquitous solvent in chemistry. Aqueous solution is water with a pH of 7.0 where the hydrogen ions (H+) and hydroxide ions (OH−) are in Arrhenius balance (10−7).
• The first solvation shell of a sodium ion dissolved in water.
• A non-aqueous solution is a solution in which the solvent is a liquid, but is not water.[1] (See also Solvent and Inorganic nonaqueous solvent.)
• Substances that are hydrophobic ('water-fearing') do not dissolve well in water, whereas those that are hydrophilic ('water-friendly') do. An example of a hydrophilic substance is sodium chloride. Acids and bases are aqueous solutions, as part of their Arrhenius definitions.
• The ability of a substance to dissolve in water is determined by whether the substance can match or exceed the strong attractive forces that water molecules generate between themselves. If the substance lacks the ability to dissolve in water, the molecules form a precipitate.
• Reactions in aqueous solutions are usually metathesis reactions. Metathesis reactions are another term for doubl

Answer 2

Answer:

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