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Class 10 · Science · Easy
→Which of the following observations is not evidence that a chemical reaction has occurred?
Class 10 · Science · Easy
→When is the aqueous state symbol (aq) used in a chemical equation?
Class 10 · Science · Medium
→What is the correct meaning of upward and downward arrows in a chemical equation?
Class 10 · Science · Medium
→According to the law of conservation of mass, how should the number of atoms of each element compare on the reactant and product sides of a balanced chemical equation?
Class 10 · Science · Medium
→Why are coefficients changed instead of chemical formulae while balancing equations?
Class 10 · Science · Medium
→On what basis can respiration be related to combustion?
Class 10 · Science · Medium
→Why is a combustion reaction generally considered exothermic?
Class 10 · Science · Easy
→When two or more reactants combine to form a single product, which type of reaction is it?
Class 10 · Science · Easy
→If a chemical reaction produces two or more products from a single reactant, what type of reaction is it?
Class 10 · Science · Medium
→Which observation is the most suitable indicator of a precipitation reaction?
Class 10 · Science · Medium
→What is the correct difference between melting of ice and burning of a candle?
Class 10 · Science · Medium
→Which of the following changes is the best example of a chemical change?
Class 10 · Science · Medium
→Why are antioxidants added to food materials to prevent rancidity?
Class 10 · Science · Medium
→What is the scientific reason for filling potato chips packets with nitrogen gas?
Class 10 · Science · Medium
→A white sample of silver chloride turns grey when kept in sunlight. Which equation correctly represents this change?
Class 10 · Science · Medium
→What role do air and moisture play in the rusting of iron?
Class 10 · Science · Medium
→What is a reaction called in which one substance gains oxygen and another substance loses oxygen?
Class 10 · Science · Medium
→In the reaction CuO + H₂ → Cu + H₂O, which process occurs to hydrogen?
Class 10 · Science · Medium
→When copper oxide is heated with hydrogen, copper is formed. Which process occurs to copper oxide in this reaction?
Class 10 · Science · Medium
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