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Class 10 · Science · Medium
→When calcium carbonate is heated, the gas produced turns limewater milky. Which gas is it?
Class 10 · Science · Hard
→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 · Hard
→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 · Hard
→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 · Easy
→In an unbalanced equation, oxygen atoms are fewer on the right side. What is the most correct method during balancing?
Class 10 · Science · Medium
→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 · Medium
→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 · Easy
→Which option correctly states the position of reactants and products in a chemical equation?
Class 10 · Science · Easy
→In a chemical equation, in which situation is the symbol (aq) correctly used?
Class 10 · Science · Easy
→Which option gives the correct meaning of upward and downward arrows in a chemical equation?
Class 10 · Science · Hard
→If a colour change is observed in a process, can it be identified conclusively as a chemical reaction on this basis alone?
Class 10 · Science · Medium
→If a white insoluble solid forms in a solution but the temperature does not change, what is the correct conclusion?
Class 10 · Science · Hard
→Which statement gives the clearest identification of a chemical reaction?
Class 10 · Science · Hard
→Which of the following chemical equation represents a double displacement reaction in which a precipitate is formed?
Class 10 · Science · Hard
→Which of the following reactions shows a more reactive metal displacing a less reactive metal from its aqueous salt solution?
Class 10 · Science · Medium
→Why is conversion of milk into curd considered a chemical change in advanced questions?
Class 10 · Science · Hard
→In which of the following examples is no new substance formed and only a change of state occurs?
Class 10 · Science · Medium
→What is the correct reason for considering photosynthesis an energy-absorbing process?
Class 10 · Science · Hard
→What is the similarity between combustion and respiration?
Class 10 · Science · Easy
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