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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

Which product is not formed when baking soda is heated?Why can washing soda crystals gradually become powdery when left exposed to air?Blue vitriol becomes white on heating. On adding a few drops of water, the blue colour returns. What does this prove?How does basic toothpaste help prevent tooth decay?Why does applying baking soda give relief from the pain caused by an ant sting?Which type of substance is most suitable for relief from nettle leaf sting?The basic strength of sodium hydroxide solution may decrease if it is left open for a long time. What is the main reason?A salt can be acidic, basic, or neutral. Why is sodium chloride generally considered neutral?Aqueous sodium carbonate turns red litmus blue. What nature does this show?The pH of ammonium chloride solution is found to be less than 7. What is the correct reason?Which pair will react to form calcium sulphate and water?In which reaction is carbon dioxide gas most likely to be evolved?If a solution turns red litmus blue and phenolphthalein pink, what is its likely pH?What is the colour of methyl orange indicator in an acidic solution?Phenolphthalein turns pink in sodium hydroxide. When hydrochloric acid is added slowly, when will the colour disappear?Which gas can be released when sodium hydroxide reacts with zinc?Why is aluminium oxide called an amphoteric oxide?If dilute acid is added to an unknown solid and the evolved gas turns lime water milky, which ion is likely present in the solid?Why can bleaching powder give a chlorine-like smell when kept in moist air?Why is bleaching powder used to disinfect drinking water?