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Class 10 · Science · Medium
→If equal volumes of an acid and a base are mixed but the pH does not become 7, what could be a possible reason?
Class 10 · Science · Medium
→Phenolphthalein becomes pink and turmeric becomes reddish-brown in a solution. Which ion is likely to be in excess?
Class 10 · Science · Medium
→Sodium hydroxide kept in open air can be affected not only by moisture but also by carbon dioxide. Which substance can form?
Class 10 · Science · Medium
→If copper oxide is added to dilute hydrochloric acid, a blue-green solution may form. What nature does this prove?
Class 10 · Science · Hard
→A solution had pH 3 and after dilution it became pH 5. By how much did the hydrogen ion concentration decrease?
Class 10 · Science · Medium
→The temperature rises slightly when sodium hydroxide is added to an acidic solution. What is the reason?
Class 10 · Science · Hard
→Why does baking powder not react vigorously in dry state even though it contains baking soda and an acidic substance?
Class 10 · Science · Medium
→Methyl orange is red in a solution, but it becomes yellow when base is added slowly. What does this show?
Class 10 · Science · Medium
→A student says carbon dioxide is not an acid, so it cannot react with a base. What is the correct evaluation?
Class 10 · Science · Medium
→Lime is added to an acidic lake and the pH of water increases. Which process is this an example of?
Class 10 · Science · Medium
→From the pH point of view, why is cleaning the mouth after meals useful for teeth?
Class 10 · Science · Medium
→When hard water is mixed with aqueous washing soda, hardness decreases. What is the main reason?
Class 10 · Science · Medium
→If one metal gives no gas with an acid and another metal gives gas rapidly with the same acid, what is the correct basis of comparison?
Class 10 · Science · Medium
→Ammonium chloride solution can turn blue litmus red. What is the most appropriate reason?
Class 10 · Science · Easy
→If hydrogen ions are much more numerous than hydroxide ions in a solution, which colour is more likely with universal indicator?
Class 10 · Science · Medium
→When gypsum is heated at a controlled temperature, how much water remains in the product formed?
Class 10 · Science · Medium
→An unknown solid gives water droplets and changes colour on heating. Its colour returns after adding water. This indicates the presence of what?
Class 10 · Science · Medium
→Which statement correctly explains the difference between a strong base and a concentrated base?
Class 10 · Science · Medium
→Why does the risk of splashing increase when an acid is mixed with water very quickly?
Class 10 · Science · Hard
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