UPSC Exam > UPSC Questions > Consider the following statements.1. In its p... Start Learning for Free
Consider the following statements.
1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite
2. Chalk is a very pure form of limestone, white, and rather soft
3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acid
Choose from the following options.
- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)All of above
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements.1. In its pure state, limestone is m...
Properties of Limestone, Chalk, and Dolomite
Limestone, chalk, and dolomite are three different forms of calcium carbonate. Let's understand the properties of each form of calcium carbonate mentioned in the given statements.
1. Limestone:
- In its pure state, limestone is made up of calcite or calcium carbonate.
- It is a sedimentary rock that is formed over millions of years by the accumulation of shells, corals, and other marine debris.
- Limestone is used as a building material, as a raw material for cement production, and as a source of calcium for agriculture.
- When magnesium is also present in limestone, it is called dolomite.
2. Chalk:
- Chalk is a very pure form of limestone that is white and rather soft.
- It is composed of microscopic shells of plankton that lived in the sea millions of years ago.
- Chalk is used for writing, drawing, and as a filler in paint, plastics, and other materials.
3. Solubility of Limestone:
- Limestone is soluble in rainwater, which, with carbon dioxide from the air, forms a weak acid.
- This acid reacts with the calcium carbonate in limestone and dissolves it, forming calcium bicarbonate.
- Over time, this process can create sinkholes and other features in limestone landscapes.
Conclusion:
From the above properties of limestone, chalk, and dolomite, we can conclude that all three statements given in the question are correct. Therefore, the correct answer is option 'D' - All of the above.
Limestone, chalk, and dolomite are three different forms of calcium carbonate. Let's understand the properties of each form of calcium carbonate mentioned in the given statements.
1. Limestone:
- In its pure state, limestone is made up of calcite or calcium carbonate.
- It is a sedimentary rock that is formed over millions of years by the accumulation of shells, corals, and other marine debris.
- Limestone is used as a building material, as a raw material for cement production, and as a source of calcium for agriculture.
- When magnesium is also present in limestone, it is called dolomite.
2. Chalk:
- Chalk is a very pure form of limestone that is white and rather soft.
- It is composed of microscopic shells of plankton that lived in the sea millions of years ago.
- Chalk is used for writing, drawing, and as a filler in paint, plastics, and other materials.
3. Solubility of Limestone:
- Limestone is soluble in rainwater, which, with carbon dioxide from the air, forms a weak acid.
- This acid reacts with the calcium carbonate in limestone and dissolves it, forming calcium bicarbonate.
- Over time, this process can create sinkholes and other features in limestone landscapes.
Conclusion:
From the above properties of limestone, chalk, and dolomite, we can conclude that all three statements given in the question are correct. Therefore, the correct answer is option 'D' - All of the above.
Free Test
FREE
| Start Free Test |
Community Answer
Consider the following statements.1. In its pure state, limestone is m...
- Limestone and Chalk: Limestone and chalk are sedimentary rocks of organic origin derived from the accumulation of corals and shells in the sea.
- In its pure state, limestone is made up of calcite or calcium carbonate, but magnesium is also termed dolomite. Chalk is a very pure form of limestone, white, and rather soft.
- Limestone is soluble in rain-water, which forms a weak acid with carbon dioxide from the air.
- A region with a large stretch of limestone, therefore, possesses a very distinct type of topography.
- It is then termed a karst region, a name derived from Yugoslavia's Karst district where such topography is particularly well developed.
 | Explore Courses for UPSC exam |  |
Top Courses for UPSCView all
Top Courses for UPSC
Question Description
Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer?.
Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
Here you can find the meaning of Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Consider the following statements.1. In its pure state, limestone is made up of calcite or calcium carbonate, but where magnesium is also present it is termed dolomite2. Chalk is a very pure form of limestone, white, and rather soft3. Limestone is soluble in rain-water, which, with carbon dioxide from the air, forms a weak acidChoose from the following options.a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)All of aboveCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice UPSC tests.
| Explore Courses for UPSC exam | |
Top Courses for UPSC
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
