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Class 10 · Science · Hard
→What is the similarity between galvanisation and painting?
Class 10 · Science · Medium
→Which of the following reactions involves both oxidation and reduction occurring simultaneously?
Class 10 · Science · Hard
→What role does moisture play in the rusting of iron?
Class 10 · Science · Hard
→In which situation is a substance oxidised?
Class 10 · Science · Easy
→In which situation will a substance be reduced?
Class 10 · Science · Hard
→One substance loses oxygen and another substance gains that oxygen. What is the most accurate term for this reaction?
Class 10 · Science · Easy
→Why is the conversion of copper oxide into copper called reduction?
Class 10 · Science · Medium
→In the reaction CuO + H₂ → Cu + H₂O, the formation of water proves the oxidation of which substance?
Class 10 · Science · Hard
→When aqueous solutions of two ionic compounds are mixed, an insoluble solid forms. This is an example of which type of reaction?
Class 10 · Science · Hard
→What visible change occurs when an aqueous solution of sodium sulphate is mixed with an aqueous solution of barium chloride?
Class 10 · Science · Hard
→Metal A displaces metal B from an aqueous solution of its salt, and metal B displaces metal C from an aqueous solution of its salt. Which metal is the most reactive?
Class 10 · Science · Hard
→Zinc displaces copper from a copper sulphate solution, but copper does not displace zinc from a zinc sulphate solution. What conclusion can be drawn about the reactivity of zinc and copper?
Class 10 · Science · Hard
→When an iron nail is placed in a blue copper sulphate solution, the blue colour gradually fades because the concentration of which ion decreases?
Class 10 · Science · Hard
→When an iron nail is placed in copper sulphate solution, its mass may increase slightly. What is the most appropriate reason?
Class 10 · Science · Hard
→When an iron nail is dipped in a copper sulfate solution, which observation confirms a displacement reaction?
Class 10 · Science · Hard
→In the electrolysis of water, the volumes of gases collected at the cathode and anode are in the ratio 2:1. If the gas with the lower volume is oxygen, which gas has the higher volume?
Class 10 · Science · Medium
→Why is the use of silver bromide in photography possible?
Class 10 · Science · Hard
→When silver chloride is kept in sunlight, it turns grey. Which form of energy is mainly responsible for this change?
Class 10 · Science · Hard
→Why is it incorrect to identify the brown fumes observed on heating lead nitrate as oxygen?
Class 10 · Science · Hard
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