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Class 10 · Science
→An acidic substance in an ant sting causes irritation. Which substance is most suitable?
Class 10 · Science
→Why is very low pH in the mouth dangerous for tooth decay?
Class 10 · Science
→A person has indigestion due to excess acidity. Which substance would be most suitable for relief?
Class 10 · Science
→Why may excessive heating of gypsum reduce the useful setting property of plaster of Paris?
Class 10 · Science
→Why should plaster of Paris be used quickly after mixing with water?
Class 10 · Science
→Why does the solution near the cathode become basic in the chlor-alkali process?
Class 10 · Science
→What happens at the anode in the chlor-alkali process?
Class 10 · Science
→Why is electrolysis of brine important in the chlor-alkali process?
Class 10 · Science
→Why is it not proper to leave bleaching powder open in moist air?
Class 10 · Science
→How does carbon dioxide produced in a soda-acid fire extinguisher help put out fire?
Class 10 · Science
→Why may a cake not rise properly if baking powder has no mild acid?
Class 10 · Science
→The gas formed on heating baking soda is passed through lime water. What will happen?
Class 10 · Science
→Washing soda crystals contain a fixed amount of water. What is this water called?
Class 10 · Science
→Blue copper sulphate crystals become white on heating and turn blue again on adding water. What does this prove?
Class 10 · Science
→Which salt solution is likely to have a pH less than 7?
Class 10 · Science
→Which salt solution is likely to have a pH greater than 7?
Class 10 · Science
→Ammonium chloride solution can turn blue indicator paper red. What is the correct reason?
Class 10 · Science
→Why is sodium carbonate solution basic?
Class 10 · Science
→Aqueous sodium chloride solution shows no change with red or blue indicator paper. What is the reason?
Class 10 · Science
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