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Class 10 · Science · Medium
→Why does carbon mostly form covalent compounds?
Class 10 · Science · Easy
→In a solution, pH paper becomes deep red and blue litmus turns red. What is the safest conclusion?
Class 10 · Science · Easy
→Why is identifying acids and bases by taste prohibited in the laboratory?
Class 10 · Science · Easy
→Why is it scientifically wrong to judge an unknown solution as acid or base only by its colour?
Class 10 · Science · Medium
→How does washing soda act in softening hard water?
Class 10 · Science · Medium
→Why is a coloured solution formed in the reaction of copper oxide with dilute acid?
Class 10 · Science · Easy
→Non-metal oxides can form salts with bases. Which nature does this show?
Class 10 · Science · Medium
→Metal oxides form salt and water with acids. Which nature does this prove?
Class 10 · Science · Medium
→An insoluble substance forms salt and water with acid. Why will it not be called an alkali?
Class 10 · Science · Hard
→Equal volumes of acid and base were mixed but the solution remained basic. What is the most suitable reason?
Class 10 · Science · Hard
→Equal volumes of acid and base were mixed but the solution remained acidic. What is the most suitable reason?
Class 10 · Science · Medium
→Why does pH increase when hydroxide ions are added to an acidic solution?
Class 10 · Science · Medium
→When acid is added to a basic solution, universal indicator changes from blue to green. What is the conclusion?
Class 10 · Science · Medium
→When a base is added to an acidic solution, universal indicator changes from red to green. What happened?
Class 10 · Science · Medium
→Turmeric becomes reddish-brown and red litmus turns blue. Which ion will be in excess in the solution?
Class 10 · Science · Medium
→If methyl orange is red and phenolphthalein is colourless, what should be added to neutralise the solution?
Class 10 · Science · Medium
→If phenolphthalein is pink and methyl orange is yellow, what is the nature of the solution?
Class 10 · Science · Medium
→What chemical risk can occur by storing curd in a copper vessel?
Class 10 · Science · Medium
→The pH of a lake decreases due to acid rain. Why is this dangerous for aquatic organisms?
Class 10 · Science · Medium
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