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Class 10 · Science
→Based on the formation of a new substance, what is the correct difference between conversion of milk into curd and conversion of water into ice?
Class 10 · Science
→Which statement correctly distinguishes chewing food with teeth from digesting food by enzymes?
Class 10 · Science
→What is the correct difference in energy transformation between photosynthesis and cellular respiration?
Class 10 · Science
→Why is respiration considered a slow and controlled energy-releasing process compared with combustion?
Class 10 · Science
→In a chemical equation, heat energy is written on the reactant side, and one compound breaks down to form two or more products. What type of reaction is this?
Class 10 · Science
→If heat is written on the products side of a chemical equation and the reaction vessel feels warm, what is the nature of the reaction?
Class 10 · Science
→If a container becomes cold during a process and gas is observed evolving, what is the most cautious conclusion?
Class 10 · Science
→Which problem do antioxidants and airtight packing both reduce?
Class 10 · Science
→Why do foods containing oils and fats remain unspoiled for longer when packed in nitrogen-filled packets?
Class 10 · Science
→Why can ghee kept in warm open air spoil quickly?
Class 10 · Science
→Which main chemical reaction causes the change in taste and smell during rancidity of oils and fats?
Class 10 · Science
→Which of the following equation represents a reaction that is both a combination reaction and an exothermic reaction?
Class 10 · Science
→Why can rusting begin when a painted iron surface is scratched?
Class 10 · Science
→Which condition will be most helpful for rusting of iron?
Class 10 · Science
→Removal of hydrogen and addition of hydrogen are associated with which processes, respectively?
Class 10 · Science
→Which statement about oxidation and reduction is correct?
Class 10 · Science
→In the same reaction, one substance loses oxygen and another gains oxygen. What is it called?
Class 10 · Science
→In the reaction CuO + H₂ → Cu + H₂O, water is formed. What does this show about hydrogen?
Class 10 · Science
→When black copper(II) oxide is heated with hydrogen gas, it changes into reddish-brown copper. This change is primarily evidence of which process?
Class 10 · Science
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