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Class 10 · Science · Medium
→Which reaction causes corrosion of marble by acid rain?
Class 10 · Science · Medium
→A farmer finds soil pH to be 9. Why may adding organic manure be advised?
Class 10 · Science · Medium
→A farmer tests soil and finds its pH to be 5. Which measure is suitable to improve crop growth?
Class 10 · Science · Easy
→An acidic substance in an ant sting causes irritation. Which substance is most suitable?
Class 10 · Science · Medium
→Why is very low pH in the mouth dangerous for tooth decay?
Class 10 · Science · Easy
→A person has indigestion due to excess acidity. Which substance would be most suitable for relief?
Class 10 · Science · Medium
→Why may excessive heating of gypsum reduce the useful setting property of plaster of Paris?
Class 10 · Science · Medium
→Why should plaster of Paris be used quickly after mixing with water?
Class 10 · Science · Hard
→Why does the solution near the cathode become basic in the chlor-alkali process?
Class 10 · Science · Hard
→What happens at the anode in the chlor-alkali process?
Class 10 · Science · Hard
→Why is electrolysis of brine important in the chlor-alkali process?
Class 10 · Science · Medium
→Why is it not proper to leave bleaching powder open in moist air?
Class 10 · Science · Medium
→How does carbon dioxide produced in a soda-acid fire extinguisher help put out fire?
Class 10 · Science · Medium
→Why may a cake not rise properly if baking powder has no mild acid?
Class 10 · Science · Medium
→The gas formed on heating baking soda is passed through lime water. What will happen?
Class 10 · Science · Easy
→Washing soda crystals contain a fixed amount of water. What is this water called?
Class 10 · Science · Medium
→Blue copper sulphate crystals become white on heating and turn blue again on adding water. What does this prove?
Class 10 · Science · Medium
→Which salt solution is likely to have a pH less than 7?
Class 10 · Science · Medium
→Which salt solution is likely to have a pH greater than 7?
Class 10 · Science · Medium
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