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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
उत्तर
hydrogen
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संबंधित प्रश्न
Dissolving salt in water is a reversible change.
Make a list of different types of changes with example.
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Write true or false
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Given reason:
Burning of paper is a chemical change.
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
Change of seasons
Give the reason why the following is considered as chemical changes.
An iron nail kept open in the atmosphere rusts.
Mention some of the different conditions needed for chemical changes to occur.
