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Class 10 · Science · Easy
→What does a downward arrow (↓) indicate in a chemical equation?
Class 10 · Science · Easy
→What does an upward arrow indicate in a chemical reaction?
Class 10 · Science · Easy
→Which symbol represents the liquid state of a substance in a chemical equation?
Class 10 · Science · Easy
→Which state symbol is used to represent a solid substance in a chemical equation?
Class 10 · Science · Easy
→Which symbol represents the state of a substance dissolved in water in a chemical equation?
Class 10 · Science · Easy
→Filling potato chips packets with nitrogen gas reduces which problem?
Class 10 · Science · Easy
→Why is food kept in airtight containers to reduce rancidity?
Class 10 · Science · Easy
→Rancidity is mainly caused by what?
Class 10 · Science · Easy
→Rusting of iron is closely related to which process?
Class 10 · Science · Easy
→What is the method of preventing rust by coating iron with zinc called?
Class 10 · Science · Easy
→Why is a coat of paint applied to iron to prevent rusting?
Class 10 · Science · Easy
→What can a change in smell show in a chemical reaction?
Class 10 · Science · Easy
→If bubbles are observed during a chemical reaction, what do they usually indicate?
Class 10 · Science · Easy
→Which gas is generally necessary for a combustion reaction in air?
Class 10 · Science · Easy
→Decomposition reactions in which energy must be supplied are generally of which type?
Class 10 · Science · Easy
→A large amount of heat is released when water is added to calcium oxide. What type of reaction is this?
Class 10 · Science · Easy
→What is the nature of the white powder formed when magnesium burns?
Class 10 · Science · Easy
→Why is melting of ice not a chemical reaction?
Class 10 · Science · Easy
→Cooking of rice is which type of change?
Class 10 · Science · Easy
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