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Class 10 · Science · Easy
→A student places a clean iron nail in a blue copper sulphate solution for 20 minutes. Which observation correctly confirms that a displacement reaction has occurred?
Class 10 · Science · Easy
→Which of the following changes is an indication of a chemical reaction?
Class 10 · Science · Easy
→If the temperature of a reaction mixture rises without external heating, what type of reaction does this indicate?
Class 10 · Science · Easy
→If temperature decreases in a reaction what type can it be?
Class 10 · Science · Easy
→In a combustion reaction, energy is generally released in which form?
Class 10 · Science · Easy
→What is necessary to convert a skeletal chemical equation into a complete chemical equation?
Class 10 · Science · Easy
→What must be written for the reactants and products to convert a word equation into a chemical equation?
Class 10 · Science · Easy
→What does the law of conservation of mass state?
Class 10 · Science · Easy
→What is equal on both sides of a balanced chemical equation?
Class 10 · Science · Easy
→Why is it wrong to change chemical formulae while balancing a chemical equation?
Class 10 · Science · Easy
→Which symbol denotes the state of a substance dissolved in water in a chemical equation?
Class 10 · Science · Easy
→Which symbol represents the gaseous state in a chemical equation?
Class 10 · Science · Easy
→Which is the symbol for liquid state in a chemical equation?
Class 10 · Science · Easy
→Which state symbol represents a substance in the solid state in a chemical equation?
Class 10 · Science · Easy
→What does an upward arrow ( \uparrow ) after a product in a chemical equation indicate?
Class 10 · Science · Easy
→What does a downward arrow in a chemical equation indicate?
Class 10 · Science · Easy
→Which process do antioxidants slow down?
Class 10 · Science · Easy
→What is the main reason for filling potato-chip packets with nitrogen gas?
Class 10 · Science · Easy
→What is reduced when food is kept in a cool place to prevent rancidity?
Class 10 · Science · Easy
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