Advertisements
Advertisements
प्रश्न
Give an example of the following chemical change.
A reaction where colour change is noticed
Advertisements
उत्तर
\[\ce{Fe + \underset{\text{Blue solution}}{CuSO4_(_a_q_)} ->\underset{\text{Green solution}}{FeSO4} + Cu}\]
APPEARS IN
संबंधित प्रश्न
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Give an example of a photochemical reaction.
Distinguish by dilute sulphuric acid.
Copper and magnesium?
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
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 – Thermal decomposition of mercury [II] oxide.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Is the conversion of milk into ice cream a chemical change?
