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प्रश्न
Zinc sulphide : Roasting : : zinc carbonate : _______
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उत्तर
Zinc sulphide : Roasting : : zinc carbonate : calcination
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संबंधित प्रश्न
Give reasons.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Why does a new aluminium vessel lose shine so soon after use?
Fill in the following blank with suitable word:
The non-metal present in steel is ............
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Name two metals which occur in nature in free state as well as in combined state.
Name three other metals which are extracted in a manner similar to sodium.
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Define the term:
Flux
Name:
The allotrope of the non-metal carbon which conducts electricity.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
In electrolytic reduction of alumina _______ is used as a cathode.
Write the name.
Metals which are amphoteric in nature.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain concept with example/explain with the help of a balanced equation.
Calcination
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?
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
