Advertisements
Advertisements
प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Minerals
Advertisements
उत्तर
- Most metals being reactive do not occur in nature in the free state but are found in a combined state as their salts such as oxides, carbonates, sulphides, and nitrates.
- However, some unreactive metals like silver, gold, platinum, generally occur in a free state.
- The compounds of metals that occur in nature along with the impurities are called minerals.
- For example, bauxite is a mineral of aluminium.
APPEARS IN
संबंधित प्रश्न
Give the importance of the following for living beings:
Nitrogen
Give the importance of the following for living beings:
Carbon
brown powder deposit on iron?
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Identify A and B and give their reactions with dil HCL and dil H2SO4 ?
A student has been collecting silver coins and copper coins. One day she observed a black
coating on silver coins and a green coating on copper coins. Which chemical phenomenon is
responsible for these coatings? Write the names of black and green coatings.
Name:
(a) the processes involved in
concentration :-
Explain the following term:
Gangue
On which factors does the purification of metals depend?
With a labelled diagram, explain the electro-refining of a particular metal.
`Ag2O`
................................
`MnO_2 + 4Al`
…………….
state the reactions at the two electrodes ?
Arrange the metals in (2) in the decreasing order of reactivity.
What do you observe when hydrogen is passed over heated copper oxide?
Write scientific reason.
Magnetic separation method is used to separate the magnetic ingredients in the ores.
Write the molecular formulae of the following compound.
Stannic oxide
Explain concept with example/explain with the help of a balanced equation.
Gangue
Limestone is used as a flux in the extraction of ______.
A process of extracting metals from aqueous solutions of their salts using suitable reducing agents is called ______
After partial roasting, the sulphide of copper is reduced by ______.
