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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

Why does bleaching powder lose effectiveness when kept in a moist open place?Why is it necessary to heat gypsum only at controlled temperature?Blue copper sulphate becomes white on heating and blue again on adding water. What does this prove?Sodium chloride solution has pH near 7 but still conducts electricity. What does this prove?Aqueous sugar solution does not conduct electricity while salt solution does. What is the main reason?In the chlor-alkali process, what is the correct pair of gas at cathode and gas at anode?Why is it necessary to keep the products separate in the chlor-alkali process?On heating baking soda, the gas formed turns lime water milky. What nature of solution does the remaining solid form?Baking powder reacts little in a dry container but produces gas in moist dough. What is the reason?Why does enamel risk increase when tooth pH goes below 5.5?How does basic toothpaste help protect teeth?Why does adding slaked lime to acidic soil increase pH?Why can adding organic matter improve highly basic soil?What chemical reason explains the effect of acid rain on marble?Why is it chemically unsafe to store curd or pickle in a copper vessel?Phenolphthalein turns pink and methyl orange appears yellow in a solution. What is the nature of the solution?Methyl orange is red and phenolphthalein is colourless in a solution. What should be added to neutralise it?In a solution, turmeric becomes reddish-brown and red litmus turns blue. Which ion will be in excess?A solution changes from pH 12 to pH 10. What is the correct conclusion?An acidic solution changes from pH 3 to pH 6. Approximately how much did the acidity decrease?