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Class 10 · Science · Medium
→If a basic solution is diluted with water, in which direction will its pH move?
Class 10 · Science · Medium
→Which substance can be used both for removing colour in the textile industry and for disinfecting water?
Class 10 · Science · Medium
→Magnesium gives brisk bubbles with an acid, but copper does not. What is the reason?
Class 10 · Science · Medium
→An acid and a base are mixed in equal volumes, but the pH does not become 7. Which reason is most possible?
Class 10 · Science · Easy
→If turmeric turns reddish-brown and phenolphthalein turns pink in a solution, what is the nature of the solution?
Class 10 · Science · Easy
→Why does applying a mild basic substance give relief when an ant sting contains an acidic substance?
Class 10 · Science · Medium
→In electrolysis of brine, which product is formed at the anode and what is one use of it?
Class 10 · Science · Medium
→A salt solution shows pH 7 and conducts electricity. It may be an example of which type of salt?
Class 10 · Science · Easy
→If a few drops of acid fall on the skin, what should be done first?
Class 10 · Science · Medium
→A blue salt becomes white on heating and turns blue again when water is added. Which salt could it be?
Class 10 · Science · Medium
→Why are baking soda and an edible acid both kept in baking powder?
Class 10 · Science · Medium
→The aqueous solution of a non-metal oxide turns blue litmus red. What is the nature of the non-metal oxide?
Class 10 · Science · Medium
→Which statement best describes the general nature of metal oxides?
Class 10 · Science · Hard
→If a little base is added to an acidic solution and its pH changes from 3 to 4, what is the correct conclusion?
Class 10 · Science · Hard
→Why is gas not released every time a metal is added to an acidic solution?
Class 10 · Science · Medium
→Red litmus turns blue in a solution. Acid is added gradually, and finally both litmus papers show no change. What is the final state?
Class 10 · Science · Medium
→Why is it proper to protect bleaching powder from moisture and open air?
Class 10 · Science · Medium
→Plant roots are not growing well in highly acidic soil. Which substance will be useful in a suitable amount?
Class 10 · Science · Medium
→Washing soda helps remove which ions from hard water?
Class 10 · Science · Hard
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