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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?
उत्तर
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | No reaction | Displacement | No reaction |
| Magnesium oxide | No reaction | Displacement | No reaction |
| Copper oxide | Displacement | Displacement | No reaction |
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संबंधित प्रश्न
Give reasons.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Name the most abundant metal in the earth's crust.
Name two metals which are highly resistant to corrosion.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
What is meant by the 'concentration of ore'?
Name the gas produced when calamine ore is calcined.
Name two metals which are always found in combined state.
What is the difference between a mineral and an ore?
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Which metal is extracted from calamine ore?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Give reasons, why aluminum is used in:
making alloys
How an ore is concentrated by froth floatation process?
What is meant by refining of metals? Name the three common methods used for refining.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Name the process used for the enrichment of sulphide ore.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
The poorest conductor of heat among metals is ____________.
