Advertisements
Advertisements
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 |
APPEARS IN
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by reduction with carbon.
Name the method by which aluminium metal is extracted.
Give the name and chemical formula of one ore of copper.
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
State three objectives achieved during the roasting of ores.
Aluminum is used in thermite welding:
what is thermit?
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Answer the following question :
What is the difference between calcination and roasting.
In electrolytic reduction of alumina _______ is used as a cathode.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
The poorest conductor of heat among metals is ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
