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प्रश्न
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
पर्याय
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
Which of the following pairs will give displacement reactions?
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
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.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
State three objectives achieved during the roasting of ores.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
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 ______.
Name the following:
A steel grey coloured solid non-metal.
In electrolytic reduction of alumina _______ is used as a cathode.
Write the name.
The process of extraction of aluminium from alumina-
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?
Which of the following ore is concentrated by the Froth floatation process?
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
