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प्रश्न
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
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उत्तर
Zinc sulphide is heated strongly in excess of air to convert it to zinc oxide. This process is called roasting.
\[\ce{\underset{\text{Zinc sulphide}}{2ZnS_{(s)}} + 3O_{2(g)} -> \underset{\text{Zinc oxide}}{2ZnO_{(s)}} + \underset{\text{Sulphur dioxide}}{2SO_2↑}}\]
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
The process by which sulphide ore is concentrated.
Name one metal which is extracted by reduction with heat alone.
Name the gas produced when calamine ore is calcined.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Which metal can be extracted from the following ore?
Calamine
Give the principles of electromagnetic separation.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
State three objectives achieved during the roasting of ores.
Zinc blende is converted to oxide by ______ process.
What is the difference between calcination and roasting?
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
