Advertisements
Advertisements
प्रश्न
State the change in colour observed in following case mentioning the reason:
Copper powder is strongly heated in air.
Advertisements
उत्तर
Copper powder turns from brown to black when heated vigorously in the presence of oxygen because oxygen reacts with copper powder to form copper oxide, which has a dark colour. Thus, the appearance of copper oxide is what causes the colour change.
\[\ce{2Cu(brown) +O2 ->2CuO(black)}\]
APPEARS IN
संबंधित प्रश्न
Corrosion can be prevented by using ……………. solution.
Hydrogen burns with a ______ flame and ______ sound is heard.
Explain the following in term Reduction of gain or loss of oxygen with two example.
State whether the following conversion is oxidation or reduction:
Cu2+ + 2 e-→ Cu
For the reaction PbO + H2→ Pb + H2O, which of the following statements is wrong?
Name:
a solid that is an oxidizing agent.
Complete and balance the following equation:
Fe + H2O →___________+____________
Rusting of iron involves a chemical reaction which is a combination of:
When Ag is exposed to air it gets a black coating of ____________.
The tarnishing of metals is due to the formation of ______.
