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Class 10 · Science · Expert
→What is the main reason why an oiled iron object rusts less?
Class 10 · Science · Medium
→In galvanisation, the zinc layer protects iron from contact with which substances?
Class 10 · Science · Expert
→Why can rusting start when the paint layer on iron is scratched?
Class 10 · Science · Expert
→Which pair is most essential for rusting of iron?
Class 10 · Science · Medium
→Why are oxidation and reduction understood together in a redox reaction?
Class 10 · Science · Medium
→A student claims that in the reaction 2Mg + O₂ → 2MgO, magnesium is reduced because it combines with oxygen. What is the correct evaluation of this claim?
Class 10 · Science · Expert
→Why is hydrogen oxidised in the reaction between copper oxide and hydrogen?
Class 10 · Science · Medium
→When copper oxide is heated with hydrogen, the black substance becomes reddish brown. What does this prove?
Class 10 · Science · Medium
→Why is a precipitate shown by a downward arrow in a chemical equation?
Class 10 · Science · Expert
→Formation of white solid barium sulphate shows which dual identification?
Class 10 · Science · Hard
→A student says that carbon dioxide extinguishes fire, so pouring CO₂ over a burning magnesium ribbon will put it out. Why is this statement incorrect?
Class 10 · Science · Expert
→Metal A is less reactive than metal B. What will happen when metal A is placed in the salt solution of metal B?
Class 10 · Science · Expert
→Fading of blue colour of copper sulphate solution is linked with decrease of which ion?
Class 10 · Science · Medium
→Copper deposits on an iron nail placed in copper sulphate solution. This observation is based on which principle?
Class 10 · Science · Medium
→Why does a green solution form when an iron nail is placed in copper sulphate solution?
Class 10 · Science · Medium
→On what basis is the main difference between electrolytic decomposition and photolytic decomposition identified?
Class 10 · Science · Medium
→What mainly increases when a small amount of acid is added during the electrolysis of water?
Class 10 · Science · Expert
→At which electrode is the gas with lower volume formed during electrolysis of water?
Class 10 · Science · Hard
→In which of the following reactions does an element in the same substance undergo both oxidation and reduction simultaneously?
Class 10 · Science · Medium
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