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Class 10 · Science · Medium
→Which observation gives the strongest evidence that ions are present in a solution?
Class 10 · Science · Medium
→In a reaction, mixing an acid and a base increases the solution temperature. How should this be understood?
Class 10 · Science · Medium
→A student says all salts are neutral. Which example disproves this statement?
Class 10 · Science · Easy
→Which substance is used for bleaching clothes and wood pulp?
Class 10 · Science · Easy
→Which substance is used to disinfect water because it can provide chlorine?
Class 10 · Science · Easy
→Why does foam form when baking soda and vinegar are mixed?
Class 10 · Science · Easy
→Washing soda softens hard water. Removal of which ions gives this effect?
Class 10 · Science · Easy
→If a solution turns red indicator paper blue and phenolphthalein pink, which pH is most likely?
Class 10 · Science · Medium
→Phenolphthalein is added to a colourless solution and it turns pink. On adding acid, the colour disappears. What does this show?
Class 10 · Science · Easy
→Methyl orange appears red in acidic solution and yellow in basic solution. What is this property used for?
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
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