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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
विकल्प
Right
Wrong
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उत्तर
In the electrolytic reduction of alumina, the lining of graphite acts as an anode- Wrong
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संबंधित प्रश्न
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Give two uses of bronze.
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 |
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Define the term mineral.
What iron compound is present in haematite ore? Also write its chemical formula.
Name the metal which is extracted from haematite ore.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Name the metal which is extracted from the ore called 'rock salt'.
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
Give the principles of the hydrolytic method.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Give reasons, why aluminum is used in:
In making ships
Which one of the following is not true of metal :
Metals are malleable and ductile
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
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?
An alloy 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?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
