रसायन विज्ञान – Chemistry MCQ
रसायन विज्ञान – कृषि/वन प्रवेश
Chemistry · Agriculture, Veterinary & Forestry Entrance · ३८६ प्रश्न
३८६ प्रश्न उपलब्ध। मोड छान्नुहोस्:
रसायन विज्ञान: 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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The oxidation number of carbon in CO₂ is: (CO₂ मा कार्बनको ऑक्सीकरण संख्या के हो?)
सही उत्तर: ख) +3
In CO₂, the carbon atom has an oxidation state of +4, but it is commonly represented as +3 in simplified formulas. Option 1 represents the correct and most common oxidation state.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the primary function of enzymes in biochemical reactions? (बायोकेमिकल प्रतिक्रियाहरूमा एन्जाइमको मुख्य कार्य के हो?)
सही उत्तर: क) Increase reaction rate
Enzymes are biological catalysts that speed up the rates of chemical reactions without being consumed themselves. The correct answer describes their key role in accelerating biochemical processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting nitrogen gas into ammonia by using iron and hydrogen is called: (लोहा र हाइड्रोजन प्रयोग गरेर नाइट्रोजन ग्यासलाई अमोनियामा परिवर्तन गर्ने प्रक्रियालाई के भइन्छ?)
सही उत्तर: ख) Reduction
This process involves the reduction of nitrogen gas. Iron acts as a catalyst, facilitating the reaction with hydrogen to form ammonia. The other options describe different chemical processes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solution is prepared by dissolving 2 grams of sodium chloride (NaCl) in sufficient water. What is the molarity of this solution? (पानीमा पर्याप्त मात्रामा घोलाएर दुई ग्राम सोडियम क्लोराइड (NaCl) ले बनेको घोलिको मोलरता के हो?)
सही उत्तर: घ) 4.0 M
First, calculate the moles of NaCl: 2g / 58.44 g/mol = 0.034 mol. Then, calculate molarity: 0.034 mol / 1 L = 0.034 M. The closest answer is 0.034M.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following acids has the highest acidity strength? (रसायन विज्ञानमा निम्न अम्लीयताको आधारमा कुन छ?
सही उत्तर: ग) HNO₃
Nitric acid (HNO₃) is a stronger acid than hydrochloric acid (HCl) or sulfuric acid (H₂SO₄) due to its higher electronegativity and greater ability to dissociate in water. Sulfuric acid's strength is affected by the sulfate ion, reducing its overall acidity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard reduction potential of Zn²⁺/Zn is -0.76 V and that of Cu²⁺/Cu is +0.34 V. What is the maximum possible cell potential for a galvanic cell constructed using these two metals? (Give your answer in Volts)
सही उत्तर: ख) 1.10V
The cell potential (E) is calculated as E = E°cell = Ecathode - Eanode. The cathode is the reduction half-cell (-0.76 V), and the anode is the oxidation half-cell (+0.34 V). Therefore, E = -0.76V - 0.34V = -1.10V. The most tempting answer is 0.10V as it’s a small value; however, this would require a very significant difference in potentials.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following elements is essential for chlorophyll synthesis in plants?
सही उत्तर: ग) Nitrogen
Nitrogen is a key component of chlorophyll molecules, facilitating photosynthesis. Carbon is also vital but not as directly involved in chlorophyll structure as nitrogen.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The process of converting atmospheric nitrogen into ammonia is known as:
सही उत्तर: ख) Nitrogen Fixation
Nitrogen fixation is the biological or industrial conversion of gaseous nitrogen into usable forms like ammonia. Combustion involves burning, oxidation refers to oxygen reactions and neutralization is a chemical reaction between an acid and a base.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which gas is primarily responsible for the formation of acid rain?
सही उत्तर: ख) Nitrogen Dioxide (NO₂)
Nitrogen dioxide (NO₂) reacts with water and oxygen in the atmosphere to form nitric acid, a major component of acid rain. Carbon dioxide contributes to greenhouse effects, hydrogen chloride is present but less significant, and methane is a potent greenhouse gas but not directly involved in acid rain formation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What volume of 0.5 M hydrochloric acid (HCl) would be required to neutralize a 1 mole sample of sodium bicarbonate (NaHCO₃)?
सही उत्तर: घ) 160 mL
The balanced reaction is HCl + NaHCO₃ → NaCl + H₂O + CO₂. One mole of HCl reacts with one mole of NaHCO₃. Therefore, 0.5 M HCl would require a volume of 80 mL to neutralize 1 mole of NaHCO₃.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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