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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
Give one word or a phrase:
The process by which sulphide ore is concentrated.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Write the composition of the alloy called bronze.
Name one metal which is extracted by:
Reduction with heat alone.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Give the name and chemical formula of one ore of copper.
Name two metals which occur in nature in free state as well as in combined state.
Define the term gangue.
What is the difference between a mineral and an ore?
Which metal is extracted from bauxite ore?
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Which of the following pair of metals exists in their native state in nature?
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
- Name the metal and write its chemical symbol.
- Write the name and formula of the sulphide ore.
- Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
- Name a common device in which this metal is used.
- Can this metal displace copper from copper sulphate solution? Why?
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Give the chemical formula of :
Bauxite
Name the following:
Two metals which are found in the free or native state.
Compare the process of calcination and roasting.
How are metals refined by the electrolytic methods?
What is passive iron?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Name a non- metal that has a metallic luster and sublimes on heating.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Name the following:
A steel grey coloured solid non-metal.
Define calcination.
Write the name.
Metals which are amphoteric in nature.
Gold and silver are active metals.
Explain the concept of Roasting.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain in brief types of extraction of highly reactive metals according to their reactivity.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
