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Class 10 · Science · Medium
→Considering carbon dioxide as a non-metal oxide, why does it react with lime water?
Class 10 · Science · Medium
→A metal oxide is added to an acid and salt and water are formed. What type of reaction is this?
Class 10 · Science · Hard
→An unknown solid reacts with acid to give a gas that turns limewater milky. Which ion may be present in the solid?
Class 10 · Science · Hard
→If a solution has pH 3 and it is made one hundred times less acidic, what will be the approximate new pH?
Class 10 · Science · Medium
→What is the basic reason for water formation in an acid-base reaction?
Class 10 · Science · Medium
→Which substance is useful in softening hard water?
Class 10 · Science · Medium
→A solution turns blue litmus red but keeps phenolphthalein colourless. Which conclusion is correct?
Class 10 · Science · Easy
→Turmeric turns reddish-brown in a solution. What property does this solution have?
Class 10 · Science · Medium
→Why does aqueous sodium chloride conduct electricity even though it is neutral?
Class 10 · Science · Medium
→If the pH of the mouth falls below 5, what situation develops for the teeth?
Class 10 · Science · Medium
→What is the role of acid in damaging tooth enamel?
Class 10 · Science · Medium
→Why does food become spongy when baking soda and an acid are mixed?
Class 10 · Science · Hard
→Why is controlled heating necessary to make plaster of Paris from gypsum?
Class 10 · Science · Easy
→A solution has pH 9. Acid is added and the pH becomes 7. What reaction has occurred?
Class 10 · Science · Medium
→Acid rain lowers the pH of a lake. Why can this seriously affect aquatic organisms?
Class 10 · Science · Medium
→Which experiment gives the most direct evidence for the presence of ions in an acidic solution?
Class 10 · Science · Medium
→A salt solution turns red litmus blue. It may be formed from which type of acid and base?
Class 10 · Science · Medium
→If a base solution turns phenolphthalein pink, when will the pink colour disappear on adding acid?
Class 10 · Science · Easy
→Which substance is most suitable to reduce the acid present in an ant sting?
Class 10 · Science · Easy
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