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Class 10 · Science
→Why does rancidity increase when oily food is kept in open air?
Class 10 · Science
→Why does the likelihood of rusting increase when the zinc coating in galvanisation is removed?
Class 10 · Science
→Why does an iron object rust less when kept in an airtight, dry container?
Class 10 · Science
→Why is rusting of iron considered a chemical change?
Class 10 · Science
→If hydrogen is removed from a substance, which process is it generally considered to be?
Class 10 · Science
→If hydrogen is added to a substance, which process is it generally called?
Class 10 · Science
→A student places a clean iron nail in a blue copper sulphate solution. After some time, the solution turns green and a reddish-brown coating appears on the nail. What is the correct conclusion from this experiment?
Class 10 · Science
→Which of the following chemical equations represents a displacement reaction?
Class 10 · Science
→When hydrogen gas is passed over heated copper(II) oxide, the black copper(II) oxide changes into reddish-brown copper. Which statement correctly describes this reaction?
Class 10 · Science
→Which of the following reactions is an example of both a double displacement reaction and a precipitation reaction?
Class 10 · Science
→Why is the reaction in which barium sulphate forms on mixing aqueous barium chloride and aqueous sodium sulphate called a precipitation reaction?
Class 10 · Science
→What visible change occurs when aqueous solutions of sodium sulphate and barium chloride are mixed?
Class 10 · Science
→If metal A displaces metal B from its salt solution, what is the correct conclusion about metal A?
Class 10 · Science
→Why does a reddish-brown layer form on an iron nail placed in copper sulphate solution?
Class 10 · Science
→When an iron nail is placed in copper sulphate solution, which salt is mainly present in the green solution formed?
Class 10 · Science
→During the electrolysis of water, which gas is obtained in a larger volume at the cathode?
Class 10 · Science
→Why are silver chloride and silver bromide stored in dark-coloured bottles?
Class 10 · Science
→When a single compound breaks down into two or more simpler substances on heating, what is the reaction called?
Class 10 · Science
→Which statement is correct about the reaction between calcium oxide and water?
Class 10 · Science
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