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Class 10 · Science
→A student places a clean iron nail in blue copper sulfate solution. Which observation confirms that a displacement reaction has occurred?
Class 10 · Science
→Why is an upward arrow associated with gas in a chemical equation?
Class 10 · Science
→In a chemical reaction, both heat and light are released. What type of reaction is it?
Class 10 · Science
→If a container becomes cold during a reaction, what can it indicate?
Class 10 · Science
→When bubbles are observed in a reaction mixture, what do they most commonly indicate?
Class 10 · Science
→Why is the conversion of milk into curd a chemical change?
Class 10 · Science
→In which example does only a change of state occur and no new substance form?
Class 10 · Science
→What is the main purpose of filling nitrogen gas in food packets?
Class 10 · Science
→Why does storing food in airtight containers reduce rancidity?
Class 10 · Science
→Which chemical process mainly causes oils and fats to become rancid?
Class 10 · Science
→In galvanisation, the zinc coating on iron mainly protects it from what?
Class 10 · Science
→How does applying oil to iron reduce rusting?
Class 10 · Science
→What type of chemical change is rusting of iron?
Class 10 · Science
→Which statement about oxidation and reduction in a redox reaction is correct?
Class 10 · Science
→Which of the following chemical equations represents a combination reaction?
Class 10 · Science
→When lead nitrate is heated, a brown gas is evolved. Which equation correctly represents this thermal decomposition?
Class 10 · Science
→When copper oxide is converted into copper, which process takes place?
Class 10 · Science
→How is water formed in the reaction between copper oxide and hydrogen?
Class 10 · Science
→When is using a downward arrow appropriate in a precipitation reaction?
Class 10 · Science
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