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Class 10 · Science · Medium
→If dilute acid is added to an unknown solid and the evolved gas turns lime water milky, which ion is likely present in the solid?
Class 10 · Science · Medium
→Why is aluminium oxide called an amphoteric oxide?
Class 10 · Science · Medium
→Which gas can be released when sodium hydroxide reacts with zinc?
Class 10 · Science · Medium
→Phenolphthalein turns pink in sodium hydroxide. When hydrochloric acid is added slowly, when will the colour disappear?
Class 10 · Science · Easy
→What is the colour of methyl orange indicator in an acidic solution?
Class 10 · Science · Easy
→If a solution turns red litmus blue and phenolphthalein pink, what is its likely pH?
Class 10 · Science · Easy
→In which reaction is carbon dioxide gas most likely to be evolved?
Class 10 · Science · Medium
→Which pair will react to form calcium sulphate and water?
Class 10 · Science · Medium
→The pH of ammonium chloride solution is found to be less than 7. What is the correct reason?
Class 10 · Science · Easy
→Aqueous sodium carbonate turns red litmus blue. What nature does this show?
Class 10 · Science · Medium
→A salt can be acidic, basic, or neutral. Why is sodium chloride generally considered neutral?
Class 10 · Science · Medium
→The basic strength of sodium hydroxide solution may decrease if it is left open for a long time. What is the main reason?
Class 10 · Science · Medium
→Which type of substance is most suitable for relief from nettle leaf sting?
Class 10 · Science · Easy
→Why does applying baking soda give relief from the pain caused by an ant sting?
Class 10 · Science · Easy
→How does basic toothpaste help prevent tooth decay?
Class 10 · Science · Medium
→Blue vitriol becomes white on heating. On adding a few drops of water, the blue colour returns. What does this prove?
Class 10 · Science · Medium
→Why can washing soda crystals gradually become powdery when left exposed to air?
Class 10 · Science · Easy
→Which product is not formed when baking soda is heated?
Class 10 · Science · Medium
→If an acidic solution is diluted ten times with water, which change is expected?
Class 10 · Science · Medium
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