Search questions
Choose which content to search, then combine terms with AND or OR.
Class 10 · Science · Medium
→When water is added to calcium oxide, the container becomes hot. What does this indicate about the reaction?
Class 10 · Science · Medium
→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 · Medium
→Which is the balanced chemical equation for the reaction in which hydrogen and oxygen form water?
Class 10 · Science · Easy
→Which observation provides the best evidence that a chemical reaction has occurred in an experiment?
Class 10 · Science · Easy
→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 · Easy
→Why is digestion of food considered a chemical change?
Class 10 · Science · Easy
→What does a downward arrow show in a chemical equation?
Class 10 · Science · Easy
→What does an upward arrow written with a product in a chemical equation indicate?
Class 10 · Science · Easy
→Which symbol represents an aqueous solution in a chemical equation?
Class 10 · Science · Easy
→Which symbol shows the gaseous state in a chemical equation?
Class 10 · Science · Easy
→Which symbol shows the liquid state in a chemical equation?
Class 10 · Science · Easy
→Which of the following equations represents an exothermic reaction?
Class 10 · Science · Easy
→Fall in temperature during a chemical reaction may indicate what?
Class 10 · Science · Easy
→A rise in the temperature of the reaction mixture generally indicates what?
Class 10 · Science · Easy
→Why is a combustion reaction generally exothermic?
Class 10 · Science · Easy
→In a combustion reaction fuel generally burns in the presence of which gas?
Class 10 · Science · Easy
→A clean iron nail is immersed in a blue copper sulphate solution for some time. Which observation is correct?
Class 10 · Science · Easy
→What is the main purpose of filling chips packets with nitrogen gas?
Class 10 · Science · Easy
→How do antioxidants help prevent rancidity in food?
Class 10 · Science · Easy
→