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प्रश्न
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
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उत्तर
| Heat on sodium chloride | Colour imparted to flame during flame test | Colour of flame is golden yellow |
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Explain the following reaction with one suitable example of Double decomposition reaction.
State the conditions necessary for a chemical change or reaction.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
State whether the following statement is true or false:
When a candle burns, both physical and chemical changes take place.
Explain how the painting of an iron gate prevents it from rusting.
Why is spoiling food a chemical change?
