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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 percentage composition of carbon in CH₄ is: (a) 25% (b) 50% (c) 78% (d) 100%

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  2. The reaction between iron(III) oxide (Fe₂O₃) and carbon monoxide (CO) is a redox reaction. What is the oxidation state of iron in Fe₂O₃?

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  3. Which of the following is NOT a characteristic property of organic compounds? (a) They are generally combustible. (b) They typically contain carbon and hydrogen. (c) They are usually soluble in water. (d) They often have lower melting and boiling points than inorganic compounds.

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  4. The concentration of a solution is defined as: (a) The total mass of solute in grams. (b) The volume occupied by the solution. (c) The amount of solute per unit volume of solvent. (d) The temperature at which the solution boils.

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  5. Which of the following reactions demonstrates a redox process? (a) Mixing sodium chloride with water. (b) Neutralization reaction between hydrochloric acid and sodium hydroxide. (c) Reaction between iron filings and dilute hydrochloric acid. (d) Dissolving carbon dioxide in water.

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  6. Which of the following statements accurately describes the properties of acids based on their chemical reactions? (a) Acids react with metals to produce hydrogen gas and are electrolytes. (b) Acids react with bases to form salts and water and are non-electrolytes. (c) Acids react violently with water, producing alkaline solutions and are good conductors of electricity. (d) Acids neutralise both acids and bases, forming precipitate and are generally insoluble in water.

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  7. The process by which plants absorb water from the soil primarily involves osmosis. Water potential in the roots is higher than that in the soil, causing water to move into the root cells. This movement is driven by the concentration gradient of solutes. Which of the following describes this process?

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  8. What is the primary function of an indicator in acid-base titrations?

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  9. What type of chemical bond is present between oxygen atoms in water (H₂O)?

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  10. The chemical formula for citric acid is C₆H₈O₇. What percentage of carbon by mass is present in one molecule of citric acid? (C=12, H=1, O=16)

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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।