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रसायन विज्ञान – Chemistry MCQ

रसायन विज्ञान – कृषि/वन प्रवेश

Chemistry · Agriculture, Veterinary & Forestry Entrance · ४०९ प्रश्न

सबै विषय जीव विज्ञान रसायन विज्ञान भौतिक विज्ञान अङ्ग्रेजी कृषि र वन सामान्य ज्ञान

४०९ 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।

  1. The Haber-Bosch process for ammonia synthesis requires high pressure primarily to influence which aspect of the reaction?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  2. Saponification, a key reaction in soap manufacture, involves which type of chemical change?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  3. Which of the following statements best describes the primary chemical process involved in the extraction of aluminium from bauxite ore?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  4. The rate constant (k) for a second order reaction is inversely proportional to which of the following?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  5. The decomposition of potassium chlorate (KClO₃) can be represented as: 2 KClO₃(s) → 2 KCl(s) + 3 O₂(g). When this reaction is heated, the solid KClO₃ disappears. Which statement best explains why oxygen gas is produced? (a) Oxygen is a reactant and is consumed during the reaction. (b) Oxygen is a product of the chemical decomposition of KClO₃. (c) Oxygen is released as heat is absorbed by the reaction mixture. (d) Oxygen is created from the mixing of potassium chloride and oxygen gas.

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  6. The process of dissolving ammonium chloride (NH₄Cl) in water involves the formation of ions. Which species is primarily responsible for the slight decrease in temperature observed during dissolution? (a) NH₄⁺ (b) Cl⁻ (c) H₂O (d) H₃O⁺

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  7. The reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) is a classic example of an exothermic neutralization reaction. What is the primary change in energy during this process? (a) Kinetic energy increases significantly. (b) Potential energy of the chemical bonds increases. (c) Thermal energy (heat) is released into the surroundings. (d) The mass of the products exceeds the mass of the reactants.

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  8. Which of the following statements correctly describes the process of oxidation? (a) Loss of electrons by a substance (b) Gain of oxygen by a substance (c) Gain of electrons by a substance (d) Loss of hydrogen by a substance

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  9. What is the main chemical principle behind the action of fertilizers on plants?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

  10. The reaction between hydrochloric acid (HCl) and sodium carbonate (Na₂CO₃) produces carbon dioxide gas. What is the balanced chemical equation for this reaction?

    💬 टिप्पणी / गल्ती रिपोर्ट (०)

    टिप्पणी जाँचपछि मात्र देखिन्छ।

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।