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प्रश्न
Write the molecular formulae of the following compound.
Fluorspar
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उत्तर
Fluorspar- CaF2
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संबंधित प्रश्न
Define the Ore.
What chemical process is used for obtaining a metal from its oxide?
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Name two metals which occur in nature in free state as well as in combined state.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Which metal can be extracted from the following ore?
Calamine
Give reasons, why aluminum is used in:
In making ships
Give the chemical formula of :
Cryolite
Name the following:
The mixture of materials fed into a furnace to extract a metal.
How are metals refined by the electrolytic methods?
Which method of refining is used to get 99.8% pure aluminium?
How many valence electrons are present in metals ?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Explain the concept of Roasting.
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
