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Class 10 · Science · Medium
→How can sodium hydroxide form sodium carbonate when kept in open air?
Class 10 · Science · Easy
→Turmeric turns reddish-brown and red litmus turns blue in a solution. Which ion is likely to be in excess?
Class 10 · Science · Medium
→If equal volumes of acid and base are mixed but the solution remains acidic, which reason may be correct?
Class 10 · Science · Easy
→Phenolphthalein is pink and methyl orange is yellow in a solution. What is the nature of the solution?
Class 10 · Science · Hard
→Why can excessive heating of gypsum reduce the quality of plaster of Paris?
Class 10 · Science · Medium
→Baking powder produces carbon dioxide in moist dough but generally does not react strongly in a dry container. What is the best reason?
Class 10 · Science · Medium
→A blue crystalline salt becomes white on heating and turns blue again on adding water. What does this prove?
Class 10 · Science · Hard
→Why can there be a problem in the chlor-alkali process if the products are not kept separate?
Class 10 · Science · Medium
→A solution turns red litmus blue and does not release carbon dioxide when acid is added. Which substance is most likely?
Class 10 · Science · Medium
→A dilute acid is added to a white solid and the gas turns lime water milky. If excess gas removes the milkiness, which sequence is correct?
Class 10 · Science · Medium
→Among two acids of equal concentration, the first is a better conductor of electricity. Based on this, what can the first acid be like?
Class 10 · Science · Hard
→A salt solution shows pH 6 and turns blue litmus slightly red. From what may this salt be formed?
Class 10 · Science · Hard
→An acidic solution has pH 2. If it is made ten thousand times less acidic, what will be the approximate new pH?
Class 10 · Science · Medium
→A solution gives red colour with universal indicator. After adding water the colour becomes yellow but not green. What is the correct conclusion?
Class 10 · Science · Easy
→A question says acids and bases should be identified only by colour. What is the most correct exam-based answer?
Class 10 · Science · Medium
→Why does an acidic solution not immediately become basic when a large amount of water is added?
Class 10 · Science · Medium
→In the manufacture of bleaching powder, chlorine is passed over which substance?
Class 10 · Science · Medium
→A substance forms salt and water with an acid but does not dissolve in water. What is it more correctly called?
Class 10 · Science · Easy
→If blue litmus turns red and methyl orange turns red in a solution, which substance can neutralise it?
Class 10 · Science · Easy
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