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

Acids, Bases, and Salts

अम्ल, क्षारक और लवण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, students study acids, bases, and salts through their properties, reactions, and everyday examples. The topic explains how these substances behave with indicators and with one another, including neutralisation, and introduces the formation and practical importance of common salts.

Practice questions

When sodium hydroxide is slowly added to an acidic solution, what is the main ionic change?Why does an acidic solution not immediately become basic even after strong dilution with water?Equal volumes of acid and base are mixed, yet the solution remains acidic. What is the most suitable reason?Equal volumes of acid and base are mixed, yet the solution remains basic. What is the most suitable reason?A substance forms salt and water with acid but is insoluble in water. What is it called?Why are metal oxides generally considered basic?Why are non-metal oxides generally considered acidic?When copper oxide is added to dilute hydrochloric acid, a blue-green solution forms. What does this prove?Sodium carbonate solution is basic and gives a gas with acid. How will this gas be identified?How does washing soda help soften hard water?A farmer's soil has pH 4.5. Which treatment is suitable?The pH of a lake becomes very low due to acid rain. Why does risk to aquatic organisms increase?If a solution showing blue colour with universal indicator turns green after adding acid, what happened?If a solution showing red colour with universal indicator turns green after adding base, what is the conclusion?Why does pH increase when hydroxide ions are added to an acidic solution?A metal gives gas with an acid but copper does not. What conclusion follows?Why should an unknown colourless solution not be identified only by looking at it?Why is it wrong to identify an acid or base by taste in the laboratory?A colourless solution turns blue indicator paper red but produces no bubbles with carbonate. Which conclusion is most correct?A student passes dry hydrogen chloride gas separately over dry and moist blue indicator papers. Only the moist paper turns red. Which principle is proved?