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Class 10 · Science · Medium
→What is the most correct reason for keeping silver salts in dark-coloured bottles?
Class 10 · Science · Expert
→Which product is mainly responsible for silver chloride turning grey on exposure to light?
Class 10 · Science · Expert
→When silver chloride is exposed to light, its colour changes from white to grey. This is an example of which type of decomposition reaction?
Class 10 · Science · Medium
→Which gas is identified by brown fumes in the decomposition of lead nitrate?
Class 10 · Science · Expert
→Which yellow solid residue is formed on thermal decomposition of lead nitrate?
Class 10 · Science · Expert
→Which pair correctly identifies the brown gas and the colourless gas produced when lead nitrate is heated?
Class 10 · Science · Expert
→When the gas evolved during thermal decomposition of calcium carbonate is passed through lime water, it turns milky. Which gas does this confirm?
Class 10 · Science · Expert
→Which solid and gas are formed when calcium carbonate is heated?
Class 10 · Science · Medium
→On what basis is the reaction of calcium oxide and water called an exothermic combination reaction?
Class 10 · Science · Expert
→Which product is formed when water is added to calcium oxide?
Class 10 · Science · Medium
→Why is burning of magnesium both a combination reaction and an oxidation reaction?
Class 10 · Science · Expert
→Why is a magnesium ribbon cleaned by rubbing it with sandpaper before burning?
Class 10 · Science · Medium
→What will be the ratio of magnesium atoms to oxygen atoms in four formula units of magnesium oxide?
Class 10 · Science · Expert
→How many atoms are present in total in two water molecules?
Class 10 · Science · Medium
→If iron atoms are equal but oxygen atoms are not equal in an equation, what is the equation?
Class 10 · Science · Expert
→While balancing a chemical equation, why should the subscripts in chemical formulae not be changed?
Class 10 · Science · Hard
→What is the deepest reason for keeping atoms of all elements equal on both sides of a balanced chemical equation?
Class 10 · Science · Hard
→After a reaction in an open container, the measured mass appears lower because a gas produced has escaped. What is the correct scientific explanation?
Class 10 · Science · Expert
→In a closed container, a chemical reaction produces a gas and the temperature rises, but no matter escapes. What is the correct conclusion about the total mass of the container and its contents before and after the reaction?
Class 10 · Science · Expert
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