Advertisements
Advertisements
प्रश्न
What do you observe when hydrogen is passed over heated copper oxide?
उत्तर
Black copper oxide is reduced to brown/red.
\[\ce{CuO + H2 ->[\Delta] Cu + H2O}\]
APPEARS IN
संबंधित प्रश्न
`2NaNO_3`
......................
Which metal is used for:
making pipes, buckets, water tanks,
Arrange the metals in (2) in the decreasing order of reactivity.
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite.
The following is a sketch of an electrolytic cell used in the extraction of aluminium :
(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be continuously replaced?
The chemical formula of zinc blend is _______.
Match the columns.
| Group A | Group B |
| 1. ZnS | a) Copper Sulphide |
| 2. HgS | b) Bauxite |
| c) Cinnabar | |
| d) Zinc blend |
Write the molecular formulae of the following compound.
Stannic oxide
Complete the following flowchart.
In leaching of alumina from bauxite by Bayer's process, then ore is treated with ______.
