Advertisements
Advertisements
प्रश्न
Write the chemical equation for the following reaction:
Cinnabar is heated in the presence of air.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium
Write the chemical reaction when iron reacts with dilute H2SO4.
Write the electron-dot structures for sodium, oxygen and magnesium.
Complete and balance the following equation:
Na2O + H2O →
Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.
Why does aluminium not react with water under ordinary conditions?
Name one metal which displaces silver from silver nitrate solution and one which does not.
An element is soft and can be cut with a knife. If is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
(a) Mg
(b) S
(c) P
(d) Na
An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following.
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
