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Class 10 · Science · Hard
→Why does a precipitate form when aqueous solutions of barium chloride and sodium sulphate are mixed?
Class 10 · Science · Hard
→Metal A displaces metal B from a solution of B's salt, but metal B does not displace metal A from a solution of A's salt. What is the correct conclusion?
Class 10 · Science · Hard
→If a copper strip is placed in an aqueous zinc sulphate solution and no visible change occurs, what is the correct reason?
Class 10 · Science · Hard
→Which new salt is formed when an iron nail is placed in copper sulphate solution?
Class 10 · Science · Hard
→Which of the following equations represents a decomposition reaction that occurs in the presence of light?
Class 10 · Science · Hard
→What is the main reason for storing silver chloride in a dark-coloured bottle?
Class 10 · Science · Hard
→Silver chloride turns grey in sunlight. Which substance is mainly responsible for this colour change?
Class 10 · Science · Hard
→A student placed an iron nail in a blue copper sulphate solution. After some time, the solution turned light green and a reddish-brown coating appeared on the nail. Which type of reaction does this illustrate?
Class 10 · Science · Hard
→Why is the volume of hydrogen collected at the cathode approximately twice the volume of oxygen collected at the anode during electrolysis of water?
Class 10 · Science · Hard
→What is the role of heat in the reaction of heating lead nitrate?
Class 10 · Science · Hard
→Which pair correctly identifies the brown gas and the solid residue formed on heating lead nitrate?
Class 10 · Science · Hard
→Which is the correct set of products formed when calcium carbonate is heated?
Class 10 · Science · Hard
→Which statement best describes the reaction of calcium oxide with water?
Class 10 · Science · Hard
→In a reaction, two reactants combine to form only one product, and the container becomes hot. What is the most appropriate classification of the reaction?
Class 10 · Science · Hard
→What problem occurs if subscripts are changed while balancing an equation?
Class 10 · Science · Hard
→In which situation will a chemical equation not be considered balanced?
Class 10 · Science · Hard
→In the balanced reaction for burning magnesium, if one molecule of oxygen ( ext{O}_2 ) is used, how many magnesium atoms are required?
Class 10 · Science · Hard
→In the equation \(2\mathrm{H}_2 + \mathrm{O}_2 \rightarrow ?\) for the formation of water, how many water molecules will be present on the product side?
Class 10 · Science · Hard
→In a closed container, the total mass of the reactants is 50 g. Until the reaction is complete, no matter leaves the container and no matter enters it. What will be the total mass of the products?
Class 10 · Science · Medium
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