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प्रश्न
Bauxite reacts with sodium hydroxide in the Bayer’s process.
विकल्प
Right
Wrong
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उत्तर
Bauxite reacts with sodium hydroxide in the Bayer’s process- Right
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संबंधित प्रश्न
Why do gold ornaments look new even after several years of use?
Name one metal which is extracted by:
Electrolytic reduction.
The rocky material found with ores is called ______.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
What is the difference between a mineral and an ore?
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Calamine ore can be converted into zinc oxide by the process of ______.
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
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.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
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?
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
How many valence electrons are present in non- metals?
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
In electrolytic reduction of alumina _______ is used as a cathode.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
_______ is the least reactive metal.
Write the molecular formulae of the following compound.
Fluorspar
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
