Which of the following is a sulphide ore?
- Carnallite
- Magnetite
- Copper pyrites
- Malachite
The Correct Option is C
Solution and Explanation
Top Questions on General Principles and Processes of Isolation of Elements
- The incorrect statement about the Hall-Heroult process is:
- KCET - 2024
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- A particle of mass kg is on a smooth horizontal table and moves in a circular path of radius m. The height of the table from the ground is m. If the angular speed of the particle is rad/s, the magnitude of its angular momentum about a point on the ground right under the center of the circle is:
- BITSAT - 2024
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A parallel plate capacitor with plate area and plate separation m has a capacitance of . The new capacitance of the system if half of the space between them is filled with a dielectric material of dielectric constant (as shown in the figure) will be:
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- An oil drop of radius is held stationary under a constant electric field of due to some excess electrons present on it. If the density of the oil drop is , then the number of excess electrons on the oil drop approximately is:
[Take, g = 10 m/s2]- BITSAT - 2024
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A block of mass 1 kg is pushed up a surface inclined to horizontal at an angle of by a force of 10 N parallel to the inclined surface. When the block is pushed up by 10 m along the inclined surface, the work done against frictional force is:
[Given: m/s, ]
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Questions Asked in AIIMS exam
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : 02 is liberated in the non-cyclic photophosphorylation.
Reason (R) : Liberation of oxygen is due to photolysis of water.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- Photosynthesis in higher plants
- Which gas is present predominantly in biogas
- AIIMS - 2019
- Aerobic Respiration
- Match the following column I with column II.
- AIIMS - 2019
- cloning
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : The Cro-Magnon man was the direct ancestor of the living modern man.
Reason (R) : Cro-Magnon man had slightly prognathous face.
In the light of the above statements, choose the correct answer from the options given below
- AIIMS - 2019
- evolution
- Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion: Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.
Reason: Orbital velocity of a satellite is greater than its escape velocity.
In the light of the above statements, choose the correct answer from the options given below- AIIMS - 2019
- Gravitation
Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal