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प्रश्न
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
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उत्तर
\[\ce{\underset{\text{Cinnabar}}{HgS}+\underset{\text{Oxygen from air}}{3O2}->\underset{\text{Mercury(ll) oxide}}{2HgO}+\underset{\text{Sulphur dioxide}}{2SO2}}\]
\[\ce{\underset{\text{Mercury(ii) oxide}}{2HgO}->\underset{\text{Mercury metal}}{2Hg}+\underset{\text{Oxygen gas}}{O2}}\]
In the above reaction when cinnabar is heated in the presence of oxygen, it is reduced to produce pure mercury metal.
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संबंधित प्रश्न
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron (II) sulphate | Cooper (II) sulphate | Zinc sulphate | Silver nitrate |
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals A, B, C and D.
- Which is the most reactive metal?
- What would you observe if B is added to a solution of copper (II) sulphate?
- Arrange the metals A, B, C and D in the order of decreasing reactivity.
Write the electron-dot structures for sodium, oxygen and magnesium.
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
What name is given to those metal oxides which show basic as well as acidic behaviour?
Name two metals which cannot displace hydrogen from dilute acids.
What is the action of water on aluminium? Write the equation of the chemical reaction involved.
Out of the following oxides, the amphoteric oxide is:
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Calcium floats over water during the reaction with water. Give reason.
Where does the metal aluminium, used in the thermit process, occurs in the reactivity series of metals?
