A student heats blue copper sulphate crystals and they turn white; what change is mainly happening? A New salt forms
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Chapter 28: Chemical Changes and Core Chemistry (Set-3)
When a wet cloth dries in open air, what mainly happens to the water in it? A Water reacts chemically
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A glass tumbler breaks into pieces; which statement is correct about this change? A New substance forms B Only shape
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Which change is usually reversible and forms no new substance? A Burning paper B Rusting iron C Melting ice D
Continue readingChapter 27: Matter in Our Surroundings and Atomic Structure (Set-5)
Two liquids A and B have the same temperature. A evaporates faster. The most likely reason is A has A
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On a humid day, sweat dries slowly mainly because the air has A High water vapour B Low air pressure
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When steam touches a cold surface and turns into water drops, the change is A Condensation B Evaporation C Freezing
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A closed syringe with trapped air is pressed. Which property is clearly shown? A Fixed shape B High compressibility C
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Which statement best describes matter? A Only visible things B Only living things C Has mass, occupies space D Only
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In a sealed syringe, pushing the plunger inward becomes harder mainly because A Air becomes solid B Air has no
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