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Subjects

Science

Chemical Reactions and Equations

रासायनिक अभिक्रियाएँ और समीकरण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, this topic introduces chemical reactions as changes that form new substances. Students learn to identify reactants and products, represent reactions through word and chemical equations, and write balanced equations using correct chemical formulae while following the law of conservation of mass.

Practice questions

What does colour change during a chemical reaction indicate?During a chemical reaction, the evolution of a gas is often identified by which observation?Which state symbol represents the gaseous state of a substance in a chemical equation?Which symbol denotes the liquid state of a substance in a chemical equation?Which state symbol is used to represent an aqueous solution in a chemical equation?A student writes \(H_2O_2\) instead of \(H_2O\) while balancing the equation \(H_2 + O_2 \rightarrow H_2O\). What is the correct way to correct this error?An iron nail is placed in a blue copper sulphate solution for some time. Which observation is correct?Why is digestion of food a chemical change?What type of change occurs when milk is converted into curd?What is the best way to identify that a chemical reaction has occurred?The formation of an insoluble solid on mixing two solutions is commonly an indication of what?The balanced chemical equation for the formation of water from hydrogen and oxygen is \,\(2H_2 + O_2 \rightarrow 2H_2O\). What coefficient is placed before water?When magnesium burns, with which gas does it react to form magnesium oxide?When magnesium burns in oxygen to form magnesium oxide, what type of reaction is it?When water is added to calcium oxide, the container becomes hot. What does this indicate?Which of the following reactions is an example of a displacement reaction?Why does white silver chloride turn grey in sunlight?What type of decomposition reaction occurs when silver chloride decomposes in the presence of sunlight?Which brown gas is evolved when lead nitrate is heated?In the thermal decomposition of lead nitrate, in which form is energy supplied?