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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

At which electrode is the gas of greater volume produced during the electrolysis of water?What is the purpose of adding a small amount of dilute sulphuric acid during the electrolysis of water?During the electrolysis of water, if the volume of oxygen produced is 8 mL, what volume of hydrogen will be produced at the same temperature and pressure?Why does a reddish-brown coating form on an iron nail placed in copper sulphate solution?What is the ionic reason for fading of the blue colour of copper sulphate solution?Zinc displaces copper from its salt solution, but copper does not displace zinc from its salt solution. What is the correct conclusion?Metal A displaces metal B from a solution of its salt, and metal B displaces metal C from a solution of its salt. Which metal is the most reactive?Which white precipitate forms when barium chloride and sodium sulphate solutions are mixed?Why is the reaction between barium chloride and sodium sulphate called double displacement?Why does the formation of barium sulphate on mixing aqueous solutions indicate a precipitation reaction?When copper(II) oxide is heated with hydrogen gas, copper is formed. Which process occurs to copper(II) oxide in this reaction?Formation of water in the reaction of copper oxide and hydrogen proves oxidation of which substance?If substance A loses oxygen and substance B gains that oxygen, which statement is correct?In terms of oxygen, which correctly identifies oxidation and reduction?Removal of hydrogen from a substance and addition of hydrogen to a substance indicate which processes, respectively?Which two conditions are necessary for rusting of iron?Which common principle do painting and oiling use to prevent rusting?Why does iron remain protected from rusting for some time even when a small scratch develops in the zinc coating of galvanisation?What is the main chemical cause of oils and fats becoming rancid and developing a bad smell?A student observed that when an iron nail was placed in a blue copper sulphate solution, the solution gradually turned green and a reddish-brown coating formed on the nail. What type of reaction is this?