Chemistry
Created on 10th June 2025
Grade level: Grade 10th grade
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15 Questions
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Questions (15)
1. Which among the following reactions takes place when vegetable matter decomposes into compost?
Exothermic
4 choice options
2. To which solution should Potassium Iodide be mixed to form a yellow 🟡 coloured compund?
Lead Nitrate
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3. Identify the state of CuS.
Solid
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4. Which among the following acid will fade the purple colour of Potassium permanganate solution when reacted with it?
Citric acid
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5. Which among the following is not a yellow 🟡 compound?
Copper oxide
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6. What is the balanced equation for the combustion of methane (CH4)?
CH4 + 2 O2 → CO2 + 2 H2O
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7. Which of the following is a decomposition reaction?
CaCO3 → CaO + CO2
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8. What type of reaction occurs when an acid reacts with a base?
Neutralization
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9. Which of the following statements about chemical equations is true?
The number of atoms of each element is the same on both sides of the equation after balancing.
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10. What is the law that states that mass is neither created nor destroyed in a chemical reaction?
Law of Conservation of Mass
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11. Which of the following is a balanced chemical equation?
2H2 + O2 → 2H2O
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12. What type of reaction occurs when sodium bicarbonate (NaHCO3) decomposes into sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2)?
Decomposition reaction
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13. Which of the following statements about exothermic reactions is true?
They release heat to the surroundings.
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14. What is the formula of Ethanol?
C2H5OH
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15. When Hydrogen is passed over Ethene to produce Ethane, which among the following catalyst is required?
Ni
4 choice options