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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

Washing soda crystals contain a fixed amount of water. What is this water called?The gas formed on heating baking soda is passed through lime water. What will happen?Why may a cake not rise properly if baking powder has no mild acid?How does carbon dioxide produced in a soda-acid fire extinguisher help put out fire?Why is it not proper to leave bleaching powder open in moist air?Why is electrolysis of brine important in the chlor-alkali process?What happens at the anode in the chlor-alkali process?Why does the solution near the cathode become basic in the chlor-alkali process?Why should plaster of Paris be used quickly after mixing with water?Why may excessive heating of gypsum reduce the useful setting property of plaster of Paris?A person has indigestion due to excess acidity. Which substance would be most suitable for relief?Why is very low pH in the mouth dangerous for tooth decay?An acidic substance in an ant sting causes irritation. Which substance is most suitable?A farmer tests soil and finds its pH to be 5. Which measure is suitable to improve crop growth?A farmer finds soil pH to be 9. Why may adding organic manure be advised?Which reaction causes corrosion of marble by acid rain?Methyl orange appears red in acidic solution and yellow in basic solution. What is this property used for?Phenolphthalein is added to a colourless solution and it turns pink. On adding acid, the colour disappears. What does this show?If a solution turns red indicator paper blue and phenolphthalein pink, which pH is most likely?Washing soda softens hard water. Removal of which ions gives this effect?