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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of gas.
पर्याय
oxygen
hydrogen
nitrogen
water-vapour
उत्तर
hydrogen
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Making a fruit salad with raw fruits
Classify the changes involved in the following process as physical or chemical changes:
Photosynthesis
State whether the following is physical or chemical changes.
cutting wood into small pieces —
Classify the following as physical or chemical change :
Formation of curd from milk
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Give a reason why – Heating a platinum wire is a reversible change but, heating a magnesium wire is an irreversible change.
Select the chemical changes from the following list of changes
Respiration in mammals.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Give two examples for each of the following cases:
Physical changes which are not reversible.
Iron pipes coated with zinc do not get rusted easily.
