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Class 10 · Science · Medium
→How can acid rain affect organisms living in lake water?
Class 10 · Science · Easy
→Which precaution is most suitable while handling a solution of pH 13?
Class 10 · Science · Medium
→Which statement about the nature of salts is scientifically correct?
Class 10 · Science · Medium
→Why does adding a suitable amount of slaked lime to acidic soil increase pH?
Class 10 · Science · Medium
→The pH of an acidic solution changes from 1 to 4. What happens to acidity?
Class 10 · Science · Easy
→Why is identifying an acid by taste unacceptable in the laboratory?
Class 10 · Science · Medium
→When carbon dioxide is passed into limewater, which substance causes the milkiness?
Class 10 · Science · Easy
→If the effects of hydrogen and hydroxide ions in a solution are approximately balanced, what colour will a universal indicator show?
Class 10 · Science · Medium
→Which test identifies the gas released when an acid reacts with an active metal?
Class 10 · Science · Medium
→An aqueous solution has pH 12 and feels soapy. What is the safest conclusion?
Class 10 · Science · Medium
→Which pair is correctly matched?
Class 10 · Science · Medium
→An acidic gas has no effect on dry blue litmus but turns moist blue litmus red. Why?
Class 10 · Science · Hard
→A soil sample has pH 9. Which is a more suitable way to improve its condition for crops?
Class 10 · Science · Medium
→An acidic solution produces brisk bubbles with magnesium but not with silver. What does this observation show?
Class 10 · Science · Medium
→What is the main reason for storing bleaching powder in a dry, closed container?
Class 10 · Science · Medium
→If pH changes from 4 to 7, what happens to the hydrogen-ion concentration?
Class 10 · Science · Medium
→Which important base is obtained by electrolysis of aqueous common salt solution?
Class 10 · Science · Medium
→Even after mixing equal volumes of acid and base, the solution remains acidic. What is the most likely reason?
Class 10 · Science · Easy
→Turmeric becomes reddish-brown and phenolphthalein becomes pink in a solution. What is the nature of the solution?
Class 10 · Science · Medium
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