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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 excess carbon dioxide gas is passed through sodium hydroxide solution, what can finally be the main product?A solution turns red litmus blue. When ammonium chloride is added to it and heated, a pungent-smelling gas is evolved. Which gas is it?An acidic solution has pH 2 and another acidic solution has pH 5. How many times higher is the hydrogen ion concentration in the first solution?When water is added to calcium oxide, a large amount of heat is released and calcium hydroxide is formed. What is the correct classification of this reaction?Phenolphthalein turns pink in an aqueous solution of sodium carbonate. What is the most appropriate reason?To protect tooth enamel from decay, pH should be prevented from falling below which approximate value?If sodium hydroxide solution is left exposed to air, which substance may form over time?A white powder releases heat when mixed with water and forms a milky solution. Passing carbon dioxide through this solution gives a white precipitate. What can the powder be?Methyl orange turns red in a colourless solution. On adding sodium hydroxide slowly, the colour changes to yellow. What process does this indicate?Which product is not formed when baking soda is heated?When acid is added to a metal carbonate, the evolved gas turns lime water milky. What is the correct identification and reason?A student measures the pH of four solutions: 2, 6, 7, and 11. Which solution will have the highest hydroxide ion concentration?The pH of aqueous sodium chloride solution is nearly 7. What is the correct reason?A substance dissolves in water to produce hydroxide ions and feels soapy to touch. Which class does it belong to?In which situation will a neutralisation reaction certainly occur?If much heat is released while mixing acid with water, what is the safe method?Which pair contains substances that can both be used to reduce acidity?On heating blue vitriol, its blue colour turns white. On adding a few drops of water, the blue colour returns. What is the main reason?Why is plaster of Paris stored in a closed container away from moisture?Why is sodium hydrogen carbonate used to make food items rise during cooking?