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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

A solution has pH 4. When water is added to the same solution, in which direction is its pH likely to change?A basic solution has pH 12. What happens to its pH when water is added?Four solutions have pH values 5, 7, 9 and 11. Which acidic solution among them is least harmful to teeth?An unknown solution turns blue litmus red and remains colourless with phenolphthalein. Which conclusion is correct?A solution turns red litmus blue and gives pink colour with phenolphthalein. What is the nature of the solution?In which reaction is a gas most likely to form that turns lime water milky?A gas released in the reaction of a metal with an acid gives a pop sound near a burning splint. Which gas is it?Why does copper generally not produce hydrogen gas with dilute hydrochloric acid?Which salt is formed by complete neutralisation of sodium hydroxide and sulphuric acid?Which salt is formed when calcium hydroxide reacts with hydrochloric acid?Which substance increases the amount of hydroxide ions when dissolved in water?Which statement about dilute acid and concentrated acid is correct?The difference between a strong acid and a weak acid is mainly based on what?Between equal concentration solutions of vinegar acid and hydrochloric acid, which can produce more ions?What role do sulphur dioxide and nitrogen oxides play in acid rain?In which condition will aquatic organisms in a river or lake be at greater risk from acid rain?In the electrolysis of brine in the chlor-alkali process, what is the correct order of gases formed at anode and cathode?Why is the chlor-alkali process given this name?Why can the quality of bleaching powder decrease if it is kept exposed to air for a long time?What is the main role of the edible acid present in baking powder?