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Class 10 · Science · Easy
→If heat is written on the product side of a chemical equation, what does it mean?
Class 10 · Science · Medium
→If the container becomes cold and a gas also evolves in a reaction, what is the most careful conclusion?
Class 10 · Science · Hard
→How do antioxidants help keep foods containing oils and fats fit for consumption for a longer time?
Class 10 · Science · Hard
→Filling chips packets with nitrogen gas reduces which chemical problem?
Class 10 · Science · Hard
→Why does rancidity occur faster when oily food is kept in warm, open air?
Class 10 · Science · Hard
→What type of reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\), and why?
Class 10 · Science · Hard
→One iron nail is kept in a dry, airtight bottle and another nail is kept in moist open air. Which nail will rust faster?
Class 10 · Science · Hard
→Why is rusting of iron considered an example of slow oxidation?
Class 10 · Science · Easy
→What is a reaction called in which hydrogen is removed from a substance or oxygen is added to it?
Class 10 · Science · Hard
→What is the process called in which hydrogen is added to a substance or oxygen is removed from it?
Class 10 · Science · Hard
→When oxygen is removed from one substance and, in the same reaction, added to another substance, what is the reaction called?
Class 10 · Science · Hard
→Which substance is reduced in the reaction between copper(II) oxide and hydrogen?
Class 10 · Science · Hard
→Which substance is oxidised in the reaction between copper(II) oxide and hydrogen?
Class 10 · Science · Hard
→When copper(II) oxide is heated with hydrogen gas, the black substance changes into a reddish-brown substance. What is the reddish-brown substance?
Class 10 · Science · Hard
→Which of the following reactions is both a double displacement reaction and a precipitation reaction?
Class 10 · Science · Hard
→Which of the following equations represents a double displacement reaction?
Class 10 · Science · Hard
→Why does a precipitate form when aqueous solutions of barium chloride and sodium sulphate are mixed?
Class 10 · Science · Hard
→If a copper strip is placed in an aqueous zinc sulphate solution and no visible change occurs, what is the correct reason?
Class 10 · Science · Hard
→Which new salt is formed when an iron nail is placed in copper sulphate solution?
Class 10 · Science · Hard
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