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Class 10 · Science · Medium
→If an acidic solution is diluted with water and its pH changes from 2 to 4, what happens to its hydrogen-ion concentration?
Class 10 · Science · Medium
→Which substance obtained from common salt is useful as an important base in paper and soap industries?
Class 10 · Science · Hard
→Equal volumes of an acid and a base are mixed, but pH does not become 7. Which reason is most scientific?
Class 10 · Science · Medium
→Methyl orange is yellow and phenolphthalein is pink in a solution. Which ion is likely to be in excess?
Class 10 · Science · Medium
→Copper oxide forms a coloured salt solution when added to dilute acid. What nature of copper oxide is shown?
Class 10 · Science · Medium
→Baking powder does not react strongly when dry but gives gas in moist dough. What is the main reason?
Class 10 · Science · Medium
→Magnesium and copper are separately added to an acid. Magnesium gives bubbles but copper does not. What is the correct reason?
Class 10 · Science · Hard
→If the pH of a basic solution changes from 13 to 11, approximately how did its basicity change?
Class 10 · Science · Medium
→If hydroxide ions are added to an acidic solution, what change will occur first?
Class 10 · Science · Medium
→The solid formed on heating baking soda gives a basic aqueous solution. Which solid is it?
Class 10 · Science · Medium
→The effect of acid rain on marble is due to which reaction?
Class 10 · Science · Medium
→Why does sodium chloride solution conduct electricity even though its pH is near 7?
Class 10 · Science · Medium
→A solution has pH below 5.5. What is the most correct meaning in the context of teeth?
Class 10 · Science · Medium
→A substance dissolves in water, turns red litmus blue, and gives carbon dioxide with acid. Which substance could it be?
Class 10 · Science · Medium
→Which two factors can reduce the quality of sodium hydroxide when it is kept in open air?
Class 10 · Science · Medium
→If phenolphthalein is added to an acidic solution and then a base is added slowly, when will the pink colour appear?
Class 10 · Science · Medium
→When gypsum is heated under controlled conditions, plaster of Paris is formed. How does the water content change?
Class 10 · Science · Medium
→What is one important use of the gas formed at the anode in the chlor-alkali process?
Class 10 · Science · Medium
→Washing soda crystals become powdery when kept in open air. This is related to which phenomenon?
Class 10 · Science · Medium
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