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

If a container becomes cold and gas evolves in a reaction, what is the most careful conclusion?If heat is written on the product side and the container is hot, what is the nature of the reaction?A student placed an iron nail in blue copper sulphate solution. The solution gradually turned green and a reddish-brown coating appeared on the nail. Which statement is correct?A clean iron nail is placed in blue copper sulphate solution. A reddish-brown coating forms and the solution turns light green. Which conclusion is correct?Which gas is released on heating sodium hydrogen carbonate and helps cakes rise?In an experiment both hydrogen gas and carbon dioxide gas may form. What are the correct tests to identify them?Why are metal oxides generally considered basic?Which gases are also formed when sodium hydroxide is prepared from sodium chloride solution by electrolysis?Which gas is produced at the cathode in the chlor-alkali process?What is generally required in combustion reaction?What is formed in a precipitation reaction?What is the general meaning of oxidation?What is the general meaning of reduction?What happens in a double displacement reaction?Why is a chemical equation balanced?What happens in a displacement reaction?