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

Why does a turmeric stain show a reddish-brown color when soap is applied?Why is red cabbage juice useful as an indicator?If the pH of soil becomes very low, which substance can a farmer add to improve it?What is the main role of bacteria in tooth decay?What is the reason for keeping toothpaste mildly basic?Why is baking soda useful for reducing irritation from an ant sting?Why can a solution of sodium hydrogen carbonate be applied on a bee sting?In which reaction can salt, water, and carbon dioxide all be formed?What products are generally formed in the reaction between a metal and an acid?If both magnesium and zinc react with dilute acid, which gas will be common in both reactions?A solution turns blue litmus red but keeps phenolphthalein colourless. What is the nature of the solution?A solution turns red litmus blue and phenolphthalein pink. Which could it be?An unknown sample reacts with acid to give a gas that turns lime water milky. Which class could the sample belong to?Why is it not suitable to leave sodium hydroxide open in air?A student added an acidic substance to already acidic soil. What effect is likely on plant growth?A student adds phenolphthalein to a colourless solution and observes a pink colour. Then dilute hydrochloric acid is added slowly and the pink colour disappears. Which conclusion is most correct?An unknown salt gives brown fumes on heating and leaves a yellow solid that turns white on cooling. Which salt does this indicate?A farmer has highly acidic soil and wants to reduce its acidity without harming crop roots. Which substance is most suitable?Dilute sulphuric acid is added to zinc pieces in a test tube. The evolved gas burns with a pop sound near a burning splint. What is the correct chemical reason?Dry hydrogen chloride gas is passed over dry blue litmus paper and no colour change occurs. The same gas is passed over moist blue litmus paper and it turns red. What is the reason?