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Class 10 · Science · Easy
→In a chemical equation, what do a downward arrow and an upward arrow respectively indicate?
Class 10 · Science · Expert
→Why should a chemical reaction be confirmed carefully when only a colour change is observed?
Class 10 · Science · Expert
→On what basis do curd formation from milk and ice formation from water differ?
Class 10 · Science · Expert
→A student placed an iron nail in a blue copper sulphate solution. After some time, a reddish-brown coating appeared on the nail and the solution turned green. Which is the correct conclusion from this observation?
Class 10 · Science · Expert
→What is the correct energy based difference between photosynthesis and respiration?
Class 10 · Science · Expert
→Why can combustion and respiration be considered similar on the basis of energy?
Class 10 · Science · Expert
→If heat is shown as a reactant on the left side of a chemical equation and one compound breaks down to form two or more products, what is the correct identification of the reaction?
Class 10 · Science · Easy
→If heat is written on the products side of a chemical equation, what is the nature of the reaction?
Class 10 · Science · Expert
→If the reaction vessel becomes very cold during a chemical reaction, what is the correct conclusion about the energy change?
Class 10 · Science · Expert
→What is the common purpose of antioxidants and airtight packing in food?
Class 10 · Science · Expert
→Why do chips remain fresh for a longer time in a nitrogen-filled packet?
Class 10 · Science · Expert
→A student observed that when an iron nail was placed in a blue copper sulphate solution, the solution gradually turned green and a reddish-brown coating formed on the nail. What type of reaction is this?
Class 10 · Science · Expert
→What is the main chemical cause of oils and fats becoming rancid and developing a bad smell?
Class 10 · Science · Expert
→Why does iron remain protected from rusting for some time even when a small scratch develops in the zinc coating of galvanisation?
Class 10 · Science · Expert
→Which common principle do painting and oiling use to prevent rusting?
Class 10 · Science · Medium
→Which two conditions are necessary for rusting of iron?
Class 10 · Science · Medium
→Removal of hydrogen from a substance and addition of hydrogen to a substance indicate which processes, respectively?
Class 10 · Science · Expert
→In terms of oxygen, which correctly identifies oxidation and reduction?
Class 10 · Science · Medium
→If substance A loses oxygen and substance B gains that oxygen, which statement is correct?
Class 10 · Science · Expert
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