Class 10 Oxidation Reduction and Corrosion MCQ Set 2 | NCERT CBSE JKBOSE Science

 

SET 2: Acids, Bases and Oxidation-Reduction

50 Multiple Choice Questions

Introduction: This comprehensive set focuses on oxidation-reduction reactions, corrosion, rancidity, and the fundamental concepts of electron transfer in chemical reactions. Designed for Class 10 students preparing for NCERT, JKBOSE, and CBSE examinations.

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📌 Quiz: SCIENCE

📚 Subject: CHEMISTRY

🏫 Class: CLASS 10

📖 Chapter: Chemical Reactions and Equations-B

📝 Questions: 50

📘 SCIENCE

CHEMISTRY | Chemical Reactions and Equations-B

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Q1. What happens to iron articles when left exposed for some time?

A. They become shinier

B. They get coated with a reddish-brown powder

C. They turn silver in color

D. They become magnetic

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Q2. What is the common name for the process where iron gets coated with a reddish-brown powder?

A. Galvanization

B. Rancidity

C. Rusting

D. Tarnishing

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Q3. What is the general term for the process where a metal is attacked by moisture, acids, etc.?

A. Reduction

B. Oxidation

C. Corrosion

D. Displacement

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Q4. What color coating is formed on copper due to corrosion?

A. Reddish-brown

B. Black

C. White

D. Green

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Q5. What color coating is formed on silver due to corrosion?

A. Green

B. White

C. Black

D. Blue

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Q6. Which of the following objects is specifically mentioned as being damaged by corrosion?

A. Plastic chairs

B. Wooden doors

C. Car bodies and bridges

D. Glass windows

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Q7. What is a serious economic problem mentioned regarding corrosion?

A. It makes metals stronger

B. An enormous amount of money is spent to replace damaged iron

C. It improves the appearance of metals

D. It creates new jobs in painting

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Q8. What happens to fats and oils when they are oxidised?

A. They become more nutritious

B. They become rancid

C. They solidify

D. They become sweeter

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Q9. What is the change associated with rancid food?

A. Change in color only

B. Change in smell and taste

C. Increase in weight

D. Becoming more crispy

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Q10. What are substances called that prevent oxidation in food?

A. Preservatives

B. Catalysts

C. Antioxidants

D. Reducing agents

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Q11. How does keeping food in airtight containers help?

A. It speeds up oxidation

B. It slows down oxidation

C. It makes food cook faster

D. It adds flavor

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Q12. Which gas do chips manufacturers flush into bags to prevent oxidation?

A. Oxygen

B. Carbon dioxide

C. Hydrogen

D. Nitrogen

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Q13. What is the primary reason for flushing chips bags with nitrogen?

A. To add weight

B. To prevent chips from getting oxidised

C. To improve taste

D. To make them appear fresh

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Q14. According to the summary, what must a complete chemical equation represent?

A. Only the products

B. The reactants, products, and their physical states

C. Only the reaction conditions

D. The speed of the reaction

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Q15. Why must a chemical equation always be balanced?

A. To make it look neat

B. So that the number of atoms of each type is the same on both sides

C. To include the reaction temperature

D. To write it in a shorter form

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Q16. In which reaction do two or more substances combine to form a new single substance?

A. Decomposition reaction

B. Displacement reaction

C. Combination reaction

D. Double displacement reaction

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Q17. What type of reaction is the opposite of a combination reaction?

A. Displacement

B. Double displacement

C. Decomposition

D. Oxidation

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Q18. In a decomposition reaction, what happens?

A. Two substances combine

B. A single substance decomposes into two or more substances

C. Ions are exchanged

D. An element is displaced

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Q19. What are reactions called in which heat is given out along with the products?

A. Endothermic

B. Exothermic

C. Thermal

D. Photolytic

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Q20. What are reactions called in which heat is absorbed?

A. Exothermic

B. Endothermic

C. Combustion

D. Redox

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Q21. What occurs in a displacement reaction?

A. Two compounds exchange ions

B. An element displaces another element from its compound

C. A single compound breaks down

D. Two elements combine

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Q22. What is exchanged in a double displacement reaction?

A. Heat only

B. Two different atoms or groups of atoms (ions)

C. Only electrons

D. Oxygen atoms only

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Q23. What do precipitation reactions produce?

A. Gases

B. Insoluble salts

C. Heat and light

D. Soluble compounds

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Q24. According to the summary, what is oxidation defined as?

A. Loss of oxygen or gain of hydrogen

B. Gain of oxygen or loss of hydrogen

C. Loss of electrons only

D. Gain of electrons only

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Q25. According to the summary, what is reduction defined as?

A. Gain of oxygen or loss of hydrogen

B. Loss of oxygen or gain of hydrogen

C. Loss of electrons only

D. Gain of heat

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Q26. What happens to silver chloride when placed in sunlight?

A. It melts

B. It turns white

C. It turns grey

D. It dissolves

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Q27. What causes the decomposition of silver chloride?

A. Heat

B. Electricity

C. Light (Sunlight)

D. Pressure

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Q28. What are the products of the decomposition of silver chloride in sunlight?

A. Silver and chlorine gas

B. Silver oxide and chlorine

C. Silver and oxygen

D. Silver chloride and light

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Q29. Which compound behaves similarly to silver chloride in sunlight?

A. Silver iodide

B. Silver bromide

C. Silver oxide

D. Silver nitrate

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Q30. Where is the decomposition reaction of silver salts used?

A. In cooking

B. In black and white photography

C. In making alloys

D. In water purification

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Q31. What form of energy causes the decomposition of silver chloride and silver bromide?

A. Heat energy

B. Electrical energy

C. Light energy

D. Sound energy

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Q32. Decomposition reactions require energy in the form of:

A. Heat, light, or electricity

B. Only pressure

C. Only sound

D. Only catalysts

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Q33. What type of reaction is the decomposition of silver chloride in terms of heat change?

A. Exothermic

B. Endothermic

C. Neutral

D. Combustion

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Q34. In the reaction Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s), what is observed?

A. The iron nail becomes shiny

B. The blue color of copper sulfate fades, and the nail gets a brownish coating

C. The solution turns red

D. A white precipitate forms

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Q35. What type of reaction is Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)?

A. Combination

B. Decomposition

C. Displacement

D. Double displacement

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Q36. In the displacement reaction, which element is displaced by iron?

A. Sulfur

B. Oxygen

C. Copper

D. Iron itself

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Q37. Which of the following is another example of a displacement reaction?

A. Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s)

B. NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq)

C. CaCO₃(s) → CaO(s) + CO₂(g)

D. CH₄ + 2O₂ → CO₂ + 2H₂O

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Q38. Why can zinc displace copper from its compound?

A. Zinc is less reactive than copper

B. Zinc is more reactive than copper

C. Zinc has the same reactivity as copper

D. Zinc is a noble metal

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Q39. What is the color of copper sulfate solution?

A. Colorless

B. Green

C. Blue

D. Brown

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Q40. What is the brownish coating that forms on the iron nail?

A. Iron oxide (rust)

B. Copper metal

C. Iron sulfate

D. Copper oxide

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Q41. What is the energy requirement for endothermic reactions?

A. They release heat

B. They absorb heat

C. They release light

D. They occur without any energy

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Q42. Based on the text, what is the result of mixing barium hydroxide and ammonium chloride likely to be?

A. An exothermic reaction (test tube feels hot)

B. An endothermic reaction (test tube feels cold)

C. A precipitation reaction

D. A color change

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Q43. What is the main takeaway regarding the energy for decomposition reactions?

A. They always give out energy

B. They always require an input of energy

C. They never involve energy changes

D. They only occur in sunlight

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Q44. In the context of the text, what does "tarnished" mean for metals?

A. Becoming shiny

B. Losing luster and developing a coating

C. Melting

D. Becoming magnetic

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Q45. What is the common factor between rancidity and corrosion?

A. Both involve loss of hydrogen

B. Both are caused by oxidation reactions

C. Both make substances stronger

D. Both are desirable processes

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Q46. According to the learnt points, what is always true for a balanced chemical equation?

A. It has more products than reactants

B. The mass of reactants is greater than products

C. The number of atoms of each element is the same on both sides

D. It only contains gaseous products

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Q47. What is the visual evidence that a displacement reaction has occurred between iron and copper sulfate?

A. Formation of a gas

B. Change in color of the solution and the metal

C. Formation of a pungent smell

D. The solution becomes hotter

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Q48. What is the purpose of adding antioxidants to food?

A. To make it taste sour

B. To prevent oxidation and rancidity

C. To increase its fat content

D. To change its color

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Q49. Which of the following is NOT listed as a form of energy that can cause decomposition?

A. Heat

B. Light

C. Electricity

D. Sound

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Q50. Based on the summary, which statement correctly describes a double displacement reaction?

A. One element replaces another

B. Two compounds exchange ions to form two new compounds

C. A single compound breaks down

D. Two elements combine

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