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स्वाध्यायमा कहिल्यै लापरबाही नगर। (तैत्तिरीय उपनिषद्)

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रसायन विज्ञान (Chemistry) – Chemistry MCQ

रसायन विज्ञान (Chemistry) – CEE प्रवेश

Chemistry · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४१० प्रश्न

सबै विषय भौतिक विज्ञान (Physics) रसायन विज्ञान (Chemistry) जीव विज्ञान – Zoology वनस्पति विज्ञान – Botany MAT (Mental Agility Test)

४१० प्रश्न उपलब्ध। मोड छान्नुहोस्:

रसायन विज्ञान (Chemistry): प्रश्न र उत्तर

सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।

  1. Temporary hardness of water is due to the presence of: (a) Calcium bicarbonate (b) Magnesium sulfate (c) Calcium chloride (d) Iron oxide

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  2. The colour of most transition metal ions in aqueous solution is due to: (a) Presence of hydrogen ions. (b) Formation of complex ions with different oxidation states. (c) Absorption of light by the metal atoms themselves. (d) Reaction with water molecules.

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  3. The molar mass of urea (CO(NH₂)₂) is approximately 60 g/mol. What percentage by mass of nitrogen does urea contain? (a) 14% (b) 26% (c) 38% (d) 76%

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  4. Which of the following statements is correct regarding the reaction between sodium metal and water? (a) This reaction produces hydrogen gas and sodium hydroxide. (b) This reaction generates oxygen gas and sodium oxide. (c) The reaction forms sodium hydride and water. (d) The reaction does not occur under normal conditions.

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  5. The solubility of a gas in a liquid depends on pressure. According to Henry's Law, the partial pressure of a gas over a solution is directly proportional to its concentration in that solution. If the partial pressure of O₂ over water increases from 0.2 atm to 0.8 atm at constant temperature, what will be the corresponding increase in the solubility of O₂ in water? (a) 0.4 mol/L (b) 0.2 mol/L (c) 0.6 mol/L (d) 0.8 mol/L

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  6. The following equilibrium represents a reversible reaction: 2NH₃(g) ⇌ N₂(g) + 3H₂O(g) ΔH for the reaction is positive. Which change in conditions would shift the equilibrium to the RIGHT? (a) Decreasing the pressure of the system. (b) Increasing the temperature of the system. (c) Adding more NH₃ to the system. (d) Removing N₂ from the system.

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  7. The reaction of ethane (C₂H₆) with oxygen (O₂) produces carbon dioxide (CO₂) and water (H₂O). Which of the following statements best describes this combustion process? (a) It is an exothermic reaction releasing heat energy. (b) It is an endothermic reaction absorbing heat energy. (c) It involves the formation of a covalent bond between ethane and oxygen. (d) It results in the reduction of carbon to methane.

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  8. The pH of a solution containing 0.1 M hydrochloric acid (HCl) is:

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  9. The percentage dissociation of acetic acid (CH₃COOH) in water at 25°C is 1%. What is the concentration of acetic acid in mol/L?

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  10. The chemical name of bleaching powder is commonly given as: (a) Calcium carbonate (b) Sodium chloride (c) Calcium oxychloride (d) Potassium permanganate

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