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Class 10 · Science · Medium
→In the balanced chemical equation for burning magnesium, \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\), how many magnesium atoms are on the reactant side?
Class 10 · Science · Medium
→Why must subscripts in chemical formulae not be changed while balancing a chemical equation?
Class 10 · Science · Medium
→Before balancing a chemical equation, what should be checked first?
Class 10 · Science · Medium
→In an unknown reaction, the colour changes, heat is released, and a gas forms. What is the most suitable conclusion?
Class 10 · Science · Medium
→Which of the following involves only a physical change?
Class 10 · Science · Medium
→In which experiment does the volume ratio of the gases obtained indicate the composition of water?
Class 10 · Science · Medium
→In which example are both gas evolution and a colour change observed as signs of a chemical reaction?
Class 10 · Science · Medium
→If heat is written on the reactant side of a chemical equation, what type of reaction is it?
Class 10 · Science · Medium
→If heat is written on the product side of a chemical equation, what type of reaction is it?
Class 10 · Science · Medium
→In which reaction is heat energy supplied as a necessary condition for the reaction rather than released as a product?
Class 10 · Science · Medium
→Which of the following methods does not help protect iron from rusting?
Class 10 · Science · Medium
→Under which condition will rancidity in oily food increase the fastest?
Class 10 · Science · Medium
→When the ions of two ionic compounds exchange partners to form two new compounds, what is this reaction called?
Class 10 · Science · Medium
→Which statement about a displacement reaction is correct?
Class 10 · Science · Medium
→While balancing a chemical equation, what must not be changed?
Class 10 · Science · Medium
→What is the most important care while converting a word equation into a chemical equation?
Class 10 · Science · Medium
→If the number of atoms of an element is not the same on the reactant and product sides of a chemical equation, what is the equation called?
Class 10 · Science · Medium
→Which statement correctly explains the law of conservation of mass?
Class 10 · Science · Easy
→If a downward arrow (↓) is shown next to a product in a chemical equation, what does it indicate?
Class 10 · Science · Easy
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