Occurance and Extraction of Metals — Flashcards
Telangana Open School (TOSS) · Class 12 · Chemistry
30 flashcards for Occurance and Extraction of Metals (Telangana Open School (TOSS) Class 12 Chemistry) to test yourself on key terms and facts.
Interactive on Super Tutor
Studying Occurance and Extraction of Metals? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
Free trial, no card needed.
What is the difference between a mineral and an ore?
Answer
A mineral is a naturally occurring substance in which a metal or its compound exists. An ore is a mineral from which a metal can be extracted economically. All ores are minerals, but not all minerals …
Why do noble metals like gold and silver occur in the native state?
Answer
Noble metals have low reactivity and show little affinity for air, moisture, CO₂, or other non-metals. Hence, they remain in the elemental or free state in nature.
Name two metals that occur in nature as sulphides and two as oxides.
Answer
Sulphides: Zinc (ZnS), Lead (PbS). Oxides: Iron (Fe₂O₃), Aluminium (Al₂O₃·2H₂O).
What is gangue?
Answer
Gangue refers to the unwanted rocky or earthy impurities like sand, clay, or limestone present in an ore.
Explain gravity separation with an example.
Answer
Gravity separation uses water to wash away lighter gangue from heavier ore particles. It is used for oxide ores like haematite (Fe₂O₃) and tinstone (SnO₂), which are denser than impurities.
How is magnetic separation used in ore concentration?
Answer
Magnetic separation separates magnetic components from non-magnetic ones. For example, tinstone (SnO₂) is non-magnetic but contains magnetic impurities like FeWO₄, which are removed using a magnet.
Why is froth floatation used for sulphide ores?
Answer
Sulphide ore particles are preferentially wetted by oil, while gangue particles are wetted by water. When air is blown, froth forms and carries the ore particles up, leaving gangue behind.
Write the chemical reaction for leaching of bauxite ore.
Answer
Al₂O₃ + 6NaOH → 2Na₃AlO₃ + 3H₂O. Aluminium oxide dissolves in NaOH, while impurities like Fe₂O₃ and SiO₂ remain insoluble and are filtered out.
+22 more flashcards
Practise AllFrequently Asked Questions
What are the important topics in Occurance and Extraction of Metals for Telangana Open School (TOSS) Class 12 Chemistry?
How many flashcards are available for Occurance and Extraction of Metals?
How should I revise Occurance and Extraction of Metals for the Telangana Open School (TOSS) Class 12 board exam?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Occurance and Extraction of Metals
Practice Quiz
Test yourself with a quick quiz
Important Questions
Exam-style questions with answers
Revision Notes
Key points for last-minute revision
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect
Study Plan
Step-by-step plan for this chapter
Syllabus
What topics to cover
For serious students
Get the full Occurance and Extraction of Metals chapter — start free.
Quizzes, flashcards, an AI doubt solver and a study plan for Telangana Open School (TOSS) Class 12 Chemistry. Free to start, no card needed.