Which of the following prevents rusting by sacrificial protection (NCERT)?

connecting a more reactive metal like zinc or magnesium

Which is NOT a method to prevent rusting of iron?

Storing iron in moist air. Quick parse - a typical chemistry numerical. We are after the quantity the stem asks for. Tool of choice - hence the answer = Storing iron in moist air. Rearrange it for the unknown before substituting. Common-sense check: corrosion of iron: 4Fe + 3O2 + 2xH2O -> 2Fe2O3.xH2O (hydrated ferric oxide). Lock in option A) Storing iron in moist air. Trap-watch: option B) 'Galvanising with zinc' fails since Zinc gives sacrificial protection; option C) 'Applying grease or oil' is wrong because Oil forms a protective barrier.

Which everyday practice does NOT slow rancidity?

Frying food repeatedly in the same exposed oil

Class 10 · Science · Chemistry

Chemical Reactions and Equations MCQs

Take an interactive Chemical Reactions and Equations quiz for Class 10 Science - tap an answer for instant feedback and a step-by-step solution. These are a few sample questions; practice the full Chemical Reactions and Equations set free on the RankByte app.

Topics covered

Writing and Balancing Chemical EquationsCombination and Decomposition ReactionsDisplacement and Double Displacement ReactionsOxidation and Reduction (Redox Reactions)Effects of Oxidation in Daily Life (Corrosion, Rancidity)Balancing, types, redox, stoichiometry

Practice Chemical Reactions and Equations by topic

Focused MCQ quizzes for each topic.

Balancing, types, redox, stoichiometry Combination and Decomposition Reactions Displacement and Double Displacement Reactions Effects of Oxidation in Daily Life (Corrosion, Rancidity)Oxidation and Reduction (Redox Reactions)Writing and Balancing Chemical Equations

Chemical Reactions and EquationsQuiz - Solve & Score

A few sample questions with instant answers and solutions - the full set is in the app.

Q1. Which of the following prevents rusting by sacrificial protection (NCERT)?
- A.painting the surface
- B.keeping it in dry air
- C.connecting a more reactive metal like zinc or magnesium
- D.greasing the surface
Answer: C. connecting a more reactive metal like zinc or magnesium
Q2. Which is NOT a method to prevent rusting of iron?
- A.Storing iron in moist air
- B.Galvanising with zinc
- C.Applying grease or oil
- D.Painting the surface
Answer: A. Storing iron in moist air
Quick parse - a typical chemistry numerical. We are after the quantity the stem asks for. Tool of choice - hence the answer = Storing iron in moist air. Rearrange it for the unknown before substituting. Common-sense check: corrosion of iron: 4Fe + 3O2 + 2xH2O -> 2Fe2O3.xH2O (hydrated ferric oxide). Lock in option A) Storing iron in moist air. Trap-watch: option B) 'Galvanising with zinc' fails since Zinc gives sacrificial protection; option C) 'Applying grease or oil' is wrong because Oil forms a protective barrier.
Q3. Which everyday practice does NOT slow rancidity?
- A.Frying food repeatedly in the same exposed oil
- B.Vacuum packing
- C.Adding BHA/BHT antioxidants
- D.Refrigerating fried snacks
Answer: A. Frying food repeatedly in the same exposed oil