Muft Shiksha
Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

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

Zinc displaces copper from a copper sulphate solution, but copper does not displace zinc from a zinc sulphate solution. What conclusion can be drawn about the reactivity of zinc and copper?Metal A displaces metal B from an aqueous solution of its salt, and metal B displaces metal C from an aqueous solution of its salt. Which metal is the most reactive?What visible change occurs when an aqueous solution of sodium sulphate is mixed with an aqueous solution of barium chloride?When aqueous solutions of two ionic compounds are mixed, an insoluble solid forms. This is an example of which type of reaction?In the reaction CuO + H₂ → Cu + H₂O, the formation of water proves the oxidation of which substance?Why is the conversion of copper oxide into copper called reduction?One substance loses oxygen and another substance gains that oxygen. What is the most accurate term for this reaction?In which situation will a substance be reduced?In which situation is a substance oxidised?What role does moisture play in the rusting of iron?Which of the following reactions involves both oxidation and reduction occurring simultaneously?What is the similarity between galvanisation and painting?Which process can become faster when edible oil is kept in an open bottle and exposed to oxygen in air?How does filling nitrogen in chips packets affect the role of oxygen?Why are antioxidants useful in foods containing oils and fats?If a food packet contains more oxygen and is stored at a higher temperature, which problem becomes more likely?During a chemical reaction, which observation indicates that it is endothermic?If the reaction mixture is not heated externally, which observation strongly suggests an exothermic reaction?If, in a reaction, a single compound absorbs heat and forms two or more products, what is the most appropriate classification of the reaction?What type of reaction is represented by the following general equation? \[ A+B\rightarrow C+\text{heat} \]