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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
→A student says carbonates give hydrogen gas with acids. What is the correct correction?
Class 10 · Science · Medium
→Universal indicator is red in a solution. After adding water, the colour becomes orange. What does this show?
Class 10 · Science · Medium
→What is the chemical reason for avoiding storage of curd in copper or brass vessels?
Class 10 · Science · Medium
→The aqueous solution of a non-metal oxide is acidic. Why can it react with lime water?
Class 10 · Science · Medium
→Metal oxides react with acids to form salt and water. What general nature of metal oxides does this prove?
Class 10 · Science · Medium
→If one solution turns red litmus blue and another turns blue litmus red, what is likely to form when they are mixed?
Class 10 · Science · Medium
→Why is acid rain harmful for aquatic organisms in lakes?
Class 10 · Science · Easy
→If an aqueous solution has pH close to 14, what careful conclusion should be taken while handling it?
Class 10 · Science · Medium
→Which statement about salts is correct?
Class 10 · Science · Medium
→Why does adding a suitable amount of slaked lime to acidic soil increase the pH?
Class 10 · Science · Medium
→A small amount of base is added to an acidic solution and pH changes from 2 to 3. What is the correct conclusion?
Class 10 · Science · Easy
→A student says identifying acids by taste is the simplest method. Why is this idea wrong in the laboratory?
Class 10 · Science · Medium
→Which insoluble substance first forms when carbon dioxide is passed through lime water?
Class 10 · Science · Easy
→A solution has pH 7 and the universal indicator gives a light green colour. What nature does this indicate?
Class 10 · Science · Easy
→The gas obtained from an acid-metal reaction gives a pop sound near a burning splint. What is the conclusion of this test?
Class 10 · Science · Easy
→If an aqueous solution feels soapy and turns turmeric reddish-brown, what will be its nature?
Class 10 · Science · Easy
→Which pair shows the correct common name and chemical name?
Class 10 · Science · Medium
→An acidic gas changes the colour of moist litmus but has no effect on dry litmus. Why does it not affect dry litmus?
Class 10 · Science · Medium
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