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Class 10 · Science · Hard
→In which of the following reactions does the same element undergo both oxidation and reduction?
Class 10 · Science · Medium
→Which correctly identifies the oxidation and reduction changes in the reaction CuO + H₂ → Cu + H₂O?
Class 10 · Science · Hard
→What is the correct difference between downward arrow and upward arrow?
Class 10 · Science · Hard
→In which of the following reactions does the same substance undergo both oxidation and reduction?
Class 10 · Science · Hard
→In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which correctly identifies the oxidation and reduction?
Class 10 · Science · Hard
→Which of the following equations represents a double displacement reaction in which an insoluble precipitate is formed?
Class 10 · Science · Hard
→What is the difference between the mechanical chewing of food and its chemical digestion?
Class 10 · Science · Hard
→What is the main energy based difference between photosynthesis and respiration?
Class 10 · Science · Hard
→Why are combustion and respiration placed in the same category on the basis of energy change?
Class 10 · Science · Hard
→If heat is absorbed along with the reactants in a reaction and one compound breaks down to form two or more products, what type of reaction is it?
Class 10 · Science · Hard
→If heat is written on the products side of a chemical equation, what type of reaction does it represent?
Class 10 · Science · Hard
→A student wrote the thermal decomposition of lead nitrate as Pb(NO₃)₂ → PbO + NO₂ + O₂ and claimed that it was balanced. Which change gives the correct balanced equation?
Class 10 · Science · Hard
→Which statement is correct for the reaction \\(CuO + H_2 \rightarrow Cu + H_2O\\)?
Class 10 · Science · Hard
→In a nitrogen-filled packet, how are the oils in chips mainly prevented from becoming rancid?
Class 10 · Science · Easy
→A student heated copper powder in air. The reddish-brown copper turned black. Which statement about this change is correct?
Class 10 · Science · Easy
→What is the main chemical process behind bad taste and smell of oils and fats?
Class 10 · Science · Hard
→Why can iron remain protected from rusting for some time even if the zinc coating in galvanisation is scratched?
Class 10 · Science · Hard
→A student places a clean zinc strip in a blue copper sulphate solution. After some time, a reddish-brown coating forms on the strip and the blue colour of the solution fades. Which is the correct explanation of this observation?
Class 10 · Science · Hard
→Which environment is most favourable for rusting of iron?
Class 10 · Science · Hard
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