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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.
विकल्प
oxygen
hydrogen
nitrogen
water-vapour
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उत्तर
hydrogen
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संबंधित प्रश्न
Write true or false
Melting of ice is a physical change.
Classify the following as physical or chemical change :
Condensation of steam
Fill in the blank.
The process of a liquid changing into a solid is called ________
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –
A physical change is generally____________.
