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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

What is the correct pair of the gas formed at the cathode and the base remaining in solution in the chlor-alkali process?Why is it safer to add acid slowly into water while diluting acid?A salt solution shows both pH 7 and electrical conductivity. What type of salt can it be?The aqueous solution of a non-metal oxide turns blue litmus red. How can it react with a base?Metal oxides form salt and water with acids. This is an example of which broader rule?What chemical risk is there in storing sour substances in a brass vessel?If a solution changes from pH 4 to pH 7, what happens to hydrogen ion concentration?Why can ammonium chloride solution be acidic and sodium carbonate solution be basic?If the pH around teeth falls below 5.5, which process can start?A gas evolves when carbonate is added to an acidic solution. If the gas turns lime water milky, which gas is it?On adding acid to a solution, the pink colour of phenolphthalein disappears. What was the initial nature of the solution?In an experiment an acidic gas does not affect dry litmus. What is the exam-based reason?A soil has pH 4.5. Which treatment is more scientific?Which gas is passed over dry slaked lime in the manufacture of bleaching powder?A student says all bases dissolve in water. Which statement is the correct correction?If acid is slowly added to a basic solution, what change is expected near neutralisation?If washing soda is added to hard water, what is the main benefit of insoluble substance formation?Why can acid rain water be more corrosive than normal water?A substance's aqueous solution has excess hydrogen ions. What will happen to blue litmus?If a solution has pH 11 and phenolphthalein is pink, what will decrease first when acid is added?