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Class 10 · Science
→While heating lead nitrate, a student identified the evolved brown gas as oxygen. What is the correct correction to the student's statement?
Class 10 · Science
→When a zinc strip is placed in copper sulphate solution, which statement is correct?
Class 10 · Science
→Why does the blue colour of copper sulphate solution fade and turn green when an iron nail is added?
Class 10 · Science
→What is the ratio of the volumes of hydrogen and oxygen gases collected during the electrolysis of water?
Class 10 · Science
→Silver chloride turns grey when kept in sunlight. What is the correct reason?
Class 10 · Science
→When lead nitrate is heated, brown fumes are evolved. Which gas causes these fumes, and what type of reaction is this?
Class 10 · Science
→When water is added to calcium oxide, the container becomes hot. What does this indicate about the reaction?
Class 10 · Science
→Which is the correct match for the white powder formed when a magnesium ribbon burns in air and the type of reaction?
Class 10 · Science
→Which is the balanced chemical equation for the reaction in which hydrogen and oxygen form water?
Class 10 · Science
→Which observation provides the best evidence that a chemical reaction has occurred in an experiment?
Class 10 · Science
→A student wrote \(Mg + O_2 \rightarrow MgO\) for the burning of magnesium in oxygen and claimed that it is balanced. Which is the correct balanced equation?
Class 10 · Science
→Why is digestion of food considered a chemical change?
Class 10 · Science
→What does a downward arrow show in a chemical equation?
Class 10 · Science
→What does an upward arrow written with a product in a chemical equation indicate?
Class 10 · Science
→Which symbol represents an aqueous solution in a chemical equation?
Class 10 · Science
→Which symbol shows the gaseous state in a chemical equation?
Class 10 · Science
→Which symbol shows the liquid state in a chemical equation?
Class 10 · Science
→Which of the following equations represents an exothermic reaction?
Class 10 · Science
→Fall in temperature during a chemical reaction may indicate what?
Class 10 · Science
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