Advertisements
Advertisements
प्रश्न
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
Advertisements
उत्तर
Yes, rusting is a chemical change since a new substance is formed.
APPEARS IN
संबंधित प्रश्न
True or false
New substances are formed in a chemical change.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
The chemical change is ______.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
Give an example of a chemical reaction for the following situation:
A change in colour is observed
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
