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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 is the simplest way to identify a double displacement reaction?Which insoluble substance forms as a precipitate when an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate?What is a precipitate formed in a precipitation reaction?Which process occurs to copper(II) oxide when hydrogen gas is passed over heated copper(II) oxide?Why is a magnesium ribbon rubbed with sandpaper before burning it?What is a reaction called when oxidation and reduction both occur in the same reaction?What is a simple way to identify oxidation?What is a simple way to identify reduction?What is a reaction called in which a single compound breaks down into two or more simpler substances?Which two substances are necessary for rusting of iron?What type of reaction occurs when water is added to quicklime, CaO, to form calcium hydroxide?Which of the following is a chemical change?What is the process called in which oils and fats develop an unpleasant taste and smell due to oxidation?How do antioxidants help prevent rancidity in food?What is the main purpose of filling chips packets with nitrogen gas?A clean iron nail is immersed in a blue copper sulphate solution for some time. Which observation is correct?In a combustion reaction fuel generally burns in the presence of which gas?Why is a combustion reaction generally exothermic?A rise in the temperature of the reaction mixture generally indicates what?Fall in temperature during a chemical reaction may indicate what?