General Principles and Processes of Isolation of Elements is a Class 12 Chemistry chapter that carries about 2.0% of the Chemistry questions in NEET. Practise it with 39 questions covering 4 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, General Principles and Processes of Isolation of Elements had 9 questions, about 0.7 a year. The most in one paper was 2, in NEET 2021.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 0 |
| NEET 2025 | 0 |
| NEET 2024 | 0 |
| NEET 2023 | 1 |
| NEET 2022 | 1 |
| NEET 2021 | 2 |
| NEET 2020 | 1 |
| NEET 2019 | 1 |
| NEET 2018 | 1 |
| NEET 2017 | 1 |
| NEET 2016 | 0 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 0 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
In froth flotation, the ore particles are carried to the surface by:
Answer: B. air bubbles, with pine oil as the froth-former
Why: The sulphide ore is wetted by oil, while the gangue is wetted by water.
Calcination of zinc carbonate gives:
Answer: B. zinc oxide and carbon dioxide
Why: ZnCO₃ → ZnO + CO₂.
The van Arkel method for refining zirconium and titanium depends on:
Answer: B. formation and subsequent thermal decomposition of a volatile iodide
Why: The crude metal is converted to a volatile iodide, which is separated from non-volatile impurities and then decomposed on a hot filament to deposit pure metal.
In an Ellingham diagram, a metal oxide can be reduced by carbon at a given temperature when the carbon line:
Answer: B. lies below the metal oxide line
Why: Reduction is feasible when the coupled reaction has a negative free-energy change, which happens where the reducing agent's line lies below that of the metal oxide.
Magnetic separation is used to concentrate:
Answer: C. ores in which either the ore or the impurity is magnetic, such as tin stone with wolframite
Why: A magnetic roller separates the magnetic particles from the non-magnetic ones.
Copper matte consists mainly of:
Answer: C. Cu₂S and FeS
Why: The matte from the reverberatory furnace is charged to the Bessemer converter, where Cu₂S is converted to copper by self-reduction.
Zone refining is used to obtain very high-purity:
Answer: B. semiconductors such as silicon and germanium
Why: A molten zone is passed along a rod; impurities are more soluble in the melt and are swept to one end.
The sulphide ores are generally converted to oxides before reduction because:
Answer: C. carbon cannot easily reduce sulphides (the ΔG° of formation of most sulphides is more positive than that of CS₂), and the oxides are reduced more readily
Why: Roasting also removes sulphur as SO₂.
General Principles and Processes of Isolation of Elements carries about 2.0% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 9 times, about 0.7 questions a year.
General Principles and Processes of Isolation of Elements is a Class 12 Chemistry chapter in the NCERT syllabus.
NeetVictory has 39 practice questions on General Principles and Processes of Isolation of Elements, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
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