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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 is the most suitable sequence to confirm the presence of carbonate ions in a sample?Which substance is considered useful for reducing permanent hardness of water?In a solution both red and blue litmus do not change colour. What is the most appropriate conclusion?A gas turns moist blue litmus red. What does this indicate about the gas?A substance does not dissolve in water but reacts with acid to form salt and water. What can it be called?If a student says acids should be identified only by taste, why is this method wrong?A universal indicator gives deep red colour in one solution and violet colour in another solution. Which comparison is correct?Two acids have the same concentration. The first acid is a good conductor of electricity and the second is a weak conductor. What is the best reason?If the pH of a solution changes from 2 to 5, what happens to the hydrogen ion concentration?A white powder reacts with dilute acid to release a gas. The gas turns lime water milky, and excess gas reduces the milkiness. Which group can the white powder belong to?An aqueous salt solution shows pH 5. What is the most probable formation condition of this salt?Acid is slowly added to a basic solution. The pink colour of phenolphthalein finally disappears. What point can this indicate?In the chlor-alkali process, where is the sodium hydroxide mainly obtained?If a metal oxide reacts with an acid to form salt and water, what general nature of the metal oxide is proved?A non-metal oxide dissolves in water and forms a solution that turns blue litmus red. What type of oxide is it?Why can prolonged strong heating of gypsum form more anhydrous calcium sulphate instead of plaster of Paris?Methyl orange turns yellow and phenolphthalein turns pink in a solution. What is the nature of the solution?Why do acidic properties become clear when hydrogen chloride gas dissolves in water?If an acid solution has very little water, why may its electrical conductivity appear low?Why may washing soda crystals gradually appear like a white powder when left exposed to air?