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Class 10 · Science
→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
→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
→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
→When an iron nail is placed in copper sulphate solution, its mass may increase slightly. What is the most appropriate reason?
Class 10 · Science
→When an iron nail is dipped in a copper sulfate solution, which observation confirms a displacement reaction?
Class 10 · Science
→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
→Why is the use of silver bromide in photography possible?
Class 10 · Science
→When silver chloride is kept in sunlight, it turns grey. Which form of energy is mainly responsible for this change?
Class 10 · Science
→Why is it incorrect to identify the brown fumes observed on heating lead nitrate as oxygen?
Class 10 · Science
→When lead nitrate is heated, a brown gas and oxygen are formed. What is the solid residue?
Class 10 · Science
→When calcium carbonate is heated, the gas produced turns limewater milky. Which gas is it?
Class 10 · Science
→When water is added to calcium oxide, calcium hydroxide is formed and a large amount of heat is released. What type of reaction is this?
Class 10 · Science
→In the burning reaction of magnesium, the coefficient of the oxygen molecule displaystyle \(\mathrm{O_2}\) is 1. What will be the coefficient of magnesium displaystyle \(\mathrm{Mg}\) in the balanced equation?
Class 10 · Science
→In the balanced reaction in which hydrogen and oxygen form water, if there are two water molecules on the product side, how many hydrogen molecules are required on the reactant side?
Class 10 · Science
→In an unbalanced equation, oxygen atoms are fewer on the right side. What is the most correct method during balancing?
Class 10 · Science
→Ten grams of calcium carbonate is heated in a closed container. If no gas escapes, what will be the total mass of the products?
Class 10 · Science
→During an unknown process in a closed container, the properties of a substance changed, a new substance was formed, and the total mass remained unchanged. What is the most appropriate conclusion?
Class 10 · Science
→Which option correctly states the position of reactants and products in a chemical equation?
Class 10 · Science
→In a chemical equation, in which situation is the symbol (aq) correctly used?
Class 10 · Science
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