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Which one of the following minerals isformed by decomposition of rocks,leaving a residual mass of weatheredmaterial ?
[2011(T-2)]
  • a)
    Coal
  • b)
    Bauxite
  • c)
    Gold
  • d)
    Zinc
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Which one of the following minerals isformed by decomposition of rocks...
Explanation:
Bauxite is the mineral that is formed by the decomposition of rocks, leaving a residual mass of weathered material. Let's understand this in detail:

Formation of Bauxite:
1. Bauxite is formed through the weathering and decomposition of rocks in tropical and subtropical areas with a high rainfall.
2. The primary rock types that undergo weathering to form bauxite are igneous rocks such as basalt and granite, and sedimentary rocks like limestone and shale.
3. The process of weathering involves the breakdown of rocks due to exposure to elements such as water, wind, and temperature changes over a long period.
4. The minerals present in the rocks get chemically altered and dissolve, leaving behind a residual mass of weathered material called laterite.
5. Laterite is a reddish-brown soil-like material rich in iron and aluminum oxides, which are the main components of bauxite.

Characteristics of Bauxite:
1. Bauxite is a mixture of various aluminum hydroxide minerals, along with impurities such as silica, iron oxide, and titanium oxide.
2. It typically has a reddish-brown color due to the presence of iron oxide.
3. Bauxite is the main ore of aluminum, which is extracted from it through a refining process called the Bayer process.
4. It is an important industrial mineral used in the production of aluminum metal, as well as in the manufacture of refractory materials, abrasives, and cement.

Other Options:
- Coal: Coal is a fossil fuel formed from the remains of plants under high pressure and temperature over millions of years. It is not formed by the decomposition of rocks.
- Gold: Gold is a native element and is mainly found in veins and alluvial deposits. It is not formed by the decomposition of rocks.
- Zinc: Zinc is a chemical element and is mainly obtained from zinc sulfide ores such as sphalerite. It is not formed by the decomposition of rocks.

Therefore, the correct answer is option B) Bauxite.
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Community Answer
Which one of the following minerals isformed by decomposition of rocks...

To determine which mineral is formed by the decomposition of rocks, leaving a residual mass of weathered material, we need to analyze the options provided.
The options are:
A: Coal
B: Bauxite
C: Gold
D: Zinc
To find the correct answer, let's examine each option:
A: Coal
- Coal is not formed by the decomposition of rocks but rather from the remains of plants.
B: Bauxite
- Bauxite is the correct answer. It is a residual mineral formed by the decomposition of rocks, particularly aluminum-rich rocks like granite, through weathering processes.
C: Gold
- Gold is not formed by the decomposition of rocks but is typically found in veins or placer deposits.
D: Zinc
- Zinc is not formed by the decomposition of rocks but is often associated with ore minerals such as sphalerite.
Therefore, the correct answer is B: Bauxite. It is formed by the decomposition of rocks, leaving a residual mass of weathered material.
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Read the extract and answer the questions that follows:Minerals are usually found in “ores”. The term ore is used to describe an accumulation of any mineral mixed with other elements. The mineral content of the ore must be in sufficient concentration to make its extraction commercially viable. The type of formation or structure in which they are found determines the relative ease with which mineral ores may be mined. This also determines the cost of extraction. It is, therefore, important for us to understand the main types of formations in which minerals occur.Minerals generally occur in these forms:(i) In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.(ii) In sedimentary rocks a number of minerals occur in beds or layers. They have been formed as a result of deposition, accumulation and concentration in horizontal strata. Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. Another group of sedimentary minerals include gypsum, potash salt and sodium salt. These are formed as a result of evaporation especially in arid regions.(iii) Another mode of formation involves the decomposition of surface rocks and the removal of soluble constituents, leaving a residual mass of weathered material containing ores. Bauxite is formed this way.(iv) Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called ‘placer deposits’ and generally contain minerals, which are not corroded by water. Gold, silver, tin and platinum are most important among such minerals.(v) The ocean waters contain vast quantities of minerals, but most of these are too widely diffused to be of economic significance. However, common salt, magnesium and bromine are largely derived from ocean waters. The ocean beds, too, are rich in manganese nodules.Answer the following MCQs by choosing the most appropriate option.Q. The ocean beds, too, are rich in ______________ nodules.

Read the extract and answer the questions that follows:Minerals are usually found in “ores”. The term ore is used to describe an accumulation of any mineral mixed with other elements. The mineral content of the ore must be in sufficient concentration to make its extraction commercially viable. The type of formation or structure in which they are found determines the relative ease with which mineral ores may be mined. This also determines the cost of extraction. It is, therefore, important for us to understand the main types of formations in which minerals occur.Minerals generally occur in these forms:(i) In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.(ii) In sedimentary rocks a number of minerals occur in beds or layers. They have been formed as a result of deposition, accumulation and concentration in horizontal strata. Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. Another group of sedimentary minerals include gypsum, potash salt and sodium salt. These are formed as a result of evaporation especially in arid regions.(iii) Another mode of formation involves the decomposition of surface rocks and the removal of soluble constituents, leaving a residual mass of weathered material containing ores. Bauxite is formed this way.(iv) Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called ‘placer deposits’ and generally contain minerals, which are not corroded by water. Gold, silver, tin and platinum are most important among such minerals.(v) The ocean waters contain vast quantities of minerals, but most of these are too widely diffused to be of economic significance. However, common salt, magnesium and bromine are largely derived from ocean waters. The ocean beds, too, are rich in manganese nodules.Answer the following MCQs by choosing the most appropriate option.Q. The term _________ is used to describe an accumulation of any mineral mixed with other elements.

Read the extract and answer the questions that follows:Minerals are usually found in “ores”. The term ore is used to describe an accumulation of any mineral mixed with other elements. The mineral content of the ore must be in sufficient concentration to make its extraction commercially viable. The type of formation or structure in which they are found determines the relative ease with which mineral ores may be mined. This also determines the cost of extraction. It is, therefore, important for us to understand the main types of formations in which minerals occur.Minerals generally occur in these forms:(i) In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.(ii) In sedimentary rocks a number of minerals occur in beds or layers. They have been formed as a result of deposition, accumulation and concentration in horizontal strata. Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. Another group of sedimentary minerals include gypsum, potash salt and sodium salt. These are formed as a result of evaporation especially in arid regions.(iii) Another mode of formation involves the decomposition of surface rocks and the removal of soluble constituents, leaving a residual mass of weathered material containing ores. Bauxite is formed this way.(iv) Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called ‘placer deposits’ and generally contain minerals, which are not corroded by water. Gold, silver, tin and platinum are most important among such minerals.(v) The ocean waters contain vast quantities of minerals, but most of these are too widely diffused to be of economic significance. However, common salt, magnesium and bromine are largely derived from ocean waters. The ocean beds, too, are rich in manganese nodules.Answer the following MCQs by choosing the most appropriate option.Q. The placer deposits generally contain minerals, which are not corroded by

Read the extract and answer the questions that follows:Minerals are usually found in “ores”. The term ore is used to describe an accumulation of any mineral mixed with other elements. The mineral content of the ore must be in sufficient concentration to make its extraction commercially viable. The type of formation or structure in which they are found determines the relative ease with which mineral ores may be mined. This also determines the cost of extraction. It is, therefore, important for us to understand the main types of formations in which minerals occur.Minerals generally occur in these forms:(i) In igneous and metamorphic rocks minerals may occur in the cracks, crevices, faults or joints. The smaller occurrences are called veins and the larger are called lodes. In most cases, they are formed when minerals in liquid/molten and gaseous forms are forced upward through cavities towards the earth’s surface. They cool and solidify as they rise. Major metallic minerals like tin, copper, zinc and lead etc. are obtained from veins and lodes.(ii) In sedimentary rocks a number of minerals occur in beds or layers. They have been formed as a result of deposition, accumulation and concentration in horizontal strata. Coal and some forms of iron ore have been concentrated as a result of long periods under great heat and pressure. Another group of sedimentary minerals include gypsum, potash salt and sodium salt. These are formed as a result of evaporation especially in arid regions.(iii) Another mode of formation involves the decomposition of surface rocks and the removal of soluble constituents, leaving a residual mass of weathered material containing ores. Bauxite is formed this way.(iv) Certain minerals may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called ‘placer deposits’ and generally contain minerals, which are not corroded by water. Gold, silver, tin and platinum are most important among such minerals.(v) The ocean waters contain vast quantities of minerals, but most of these are too widely diffused to be of economic significance. However, common salt, magnesium and bromine are largely derived from ocean waters. The ocean beds, too, are rich in manganese nodules.Answer the following MCQs by choosing the most appropriate option.Q. In igneous and metamorphic rocks, minerals may occur in the

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Which one of the following minerals isformed by decomposition of rocks,leaving a residual mass of weatheredmaterial ?[2011(T-2)]a)Coalb)Bauxitec)Goldd)ZincCorrect answer is option 'B'. Can you explain this answer?
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