रसायन विज्ञान (Chemistry) – Chemistry MCQ
रसायन विज्ञान (Chemistry) – CEE प्रवेश
Chemistry · Medical Entrance (CEE) – Physics, Chemistry, Biology & MAT · ४१० प्रश्न
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।
सही: ० / ०
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What volume of 0.5 M solution of sodium chloride (NaCl) would be required to prepare 200 ml of a 0.1 M solution?
सही उत्तर: घ) 320 ml
This is a dilution problem. M₁V₁ = M₂V₂. Therefore (0.5)(V₁) = (0.1)(200), so V₁= 40 ml.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting ammonia into nitric acid on an industrial scale is known as:
सही उत्तर: ग) Contact Process
The Contact Process involves the oxidation of ammonia over a platinum catalyst to produce nitric oxide (NO), which then further oxidizes to form nitrogen dioxide (NO₂) and ultimately nitric acid. The other processes deal with different chemicals or industrial methods.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary reason why sulfuric acid (H₂SO₄) is a strong oxidizing agent?
सही उत्तर: ख) It readily loses electrons.
Option 1 is correct because H₂SO₄ is a strong oxidizing agent due to its ability to accept electrons (lose hydrogen ions) and facilitate redox reactions. The other options describe properties of the substance but do not explain why it's an oxidizing agent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following compounds will exhibit isomerism?
सही उत्तर: घ) CO₂
CO2 (carbon dioxide) has two structural isomers: linear and bent. The other options do not have the same number of atoms for each element, so they cannot form isomeric forms. Nitrogen gas(NH₃) is a linear molecule as it only requires one rotation to form its shape whereas methane (CH₄) has no rotational freedom.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The decomposition of potassium chlorate (KClO₃) can be represented as: 4KClO₃(s) → 3KClO₄(s) + KCl(s). Which statement accurately describes this reaction?
सही उत्तर: ख) The reaction is endothermic and releases heat.
Option 1 is correct because the formation of KClO₄ is an endothermic process, requiring energy input. The other options are incorrect; KCl is a solid not a precipitate in this scenario and the reaction doesn't involve a stable gaseous product (it produces a different potassium salt).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a titration experiment, if the indicator changes color close to the equivalence point, what does this suggest?
सही उत्तर: ख) The endpoint has been reached
A change in indicator color near the equivalence point signifies that the solution is approaching the stoichiometric ratio where the acid and base have completely reacted. The other options describe different titration behaviors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following compounds will produce the largest volume of gas upon complete neutralization with a strong acid at room temperature (298 K)?
सही उत्तर: घ) NaNO₃
The amount of gas produced depends on the valency and stoichiometry of the ions. NaNO₃ produces three moles of gas (NO₂) upon neutralization, while the other compounds produce fewer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of adding a small amount of a substance to a solution to prevent precipitation without affecting the main reaction is called:
सही उत्तर: ख) Titration
Titration involves adding a known concentration of acid or base to determine the concentration of another. The other options describe different chemical processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following salts is insoluble in water according to the solubility rules of Nepal?
सही उत्तर: घ) Al₂ (SO₄)₃
According to Nepali solubility rules, sulfates generally form insoluble salts with metals like aluminum. NaCl and KCl are highly soluble ionic compounds. Magnesium sulfate is a common soluble salt.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The concentration of H₂SO₄ in 1 M H₂SO₄ aqueous solution is approximately:
सही उत्तर: घ) D) 4 M
H₂SO₄ is a strong diprotic acid, meaning it dissociates completely into two hydrogen ions per molecule. Therefore, the concentration of H⁺ ions will be twice that of the initial solution’s concentration: 1M * 2 = 2M.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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