Advertisements
Advertisements
प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
विकल्प
Chemical change
Physical change
उत्तर
Chemical change
Explanation:
The passage of electric energy through water to form hydrogen and oxygen gases is a chemical change because the properties of hydrogen (a combustible gas) and oxygen (a supporter of combustion) are completely different from those of water, which is neither combustible nor a supporter of combustion but does extinguish the fire.
APPEARS IN
संबंधित प्रश्न
A physical change is temporary. Explain.
State the various conditions that favour the process of evaporation.
Make a list of different types of changes with example.
Define physical change. Give two examples for the above changes.
Tick (√) the correct alternative from the choice given for the following statement
Which one of the following is volatile in nature ?
True or false
Is melting of ice a reversible change?
Differentiate between a physical change and a chemical change with reference to – Formation of products.
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 the reason why the following is considered as chemical changes.
A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
