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Chemical Reactions

Class 10 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceWhen two aqueous solutions are mixed, a white precipitate of barium sulphate forms and sodium chloride remains in solution. Which pair of reactants is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceZinc displaces copper from copper sulphate solution, but copper does not displace zinc from zinc sulphate solution. What is the correct conclusion?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhen an iron nail is placed in copper sulphate solution, a decrease in the concentration of which ion causes the blue colour of the solution to fade?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhen an iron nail is placed in a blue copper sulphate solution, a reddish-brown copper coating forms on the nail and the solution turns pale green. What causes both changes?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn the electrolysis of water, if the volume of oxygen is five millilitres, what is the expected volume of hydrogen?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhat is the main purpose of adding a few drops of dilute sulphuric acid during the electrolysis of water?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhich of the following equations represents an exothermic combination reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhat is the deeper reason for keeping silver bromide in a dark coloured bottle?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3MediumScienceWhite silver chloride turns grey in sunlight. What type of reaction occurs, and which product causes the grey colour?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceOn heating lead nitrate, the evolution of a brown gas confirms the formation of which gas?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhen lead nitrate is heated, a brown gas evolves and a solid residue remains. Which explanation is correct?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceThe gas produced on heating calcium carbonate is passed through lime water. The milkiness of lime water is caused by the formation of which substance?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhen water is added to calcium oxide, calcium hydroxide is formed and the container becomes hot. Which two types of reaction does this represent?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhich statement best explains the relationship between a balanced chemical equation and the law of conservation of mass?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn the balanced combustion reaction of magnesium, if \(2\mathrm{MgO}\) is written on the product side, how many magnesium atoms must be on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn the balanced chemical equation for the formation of water, if there are 2 water molecules on the product side, how many oxygen molecules 0( 0 ext{O}_2 0) 0 are required on the reactant side?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceWhile balancing a chemical equation, if a student changes a subscript in the formula of water, \(\mathrm{H_2O}\), what mistake has been made?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn a closed container, 12 g of reactants completely undergo a reaction to form products, and no substance leaves the container. What will be the total mass of the products?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 3HardScienceIn which condition can conservation of mass be checked most correctly?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2MediumScienceWhich of the following observations most strongly indicates that an unknown reaction is a precipitation reaction?Class 10Chemical Substances – Nature and BehaviourChemical Reactions and EquationsLevel 2Hard

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