# Mine Gasses, Questions 1

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General Questions on Mine Gasses

• 1.

### What is the explosive range of Hydrogen Sulphide?

• A.

2.5% - 93%

• B.

5% - 15%

• C.

4.3% - 46%

• D.

12.5% - 74%

C. 4.3% - 46%
Explanation
The explosive range of Hydrogen Sulphide is 4.3% - 46%. This means that if the concentration of Hydrogen Sulphide in the air falls within this range, it can form an explosive mixture. Concentrations below 4.3% are too lean to ignite, while concentrations above 46% are too rich to ignite. It is important to be aware of this range to ensure safety when working with or around Hydrogen Sulphide.

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• 2.

### What is the occupational exposure limit for Carbon Monoxide:

• A.

50ppm over an 8 hour shift

• B.

30ppm over a 12 hour shift.

• C.

5ppm over a 12 hour shift.

• D.

30ppm over an 8 hour shift.

D. 30ppm over an 8 hour shift.
Explanation
The correct answer is 30ppm over an 8 hour shift. Occupational exposure limits are set to ensure worker safety and prevent adverse health effects from exposure to hazardous substances. In the case of Carbon Monoxide, the recommended limit is 30ppm (parts per million) over an 8 hour shift. This means that workers should not be exposed to concentrations of Carbon Monoxide higher than 30ppm on average during their 8-hour work shift to minimize health risks.

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• 3.

### Approximately, what is the percentage of Nitrogen in Normal/Fresh air?

• A.

20.9%

• B.

79.04%

• C.

19.5%

• D.

21.9%

B. 79.04%
Explanation
The correct answer is 79.04%. This is the percentage of Nitrogen in Normal/Fresh air.

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• 4.

### Oxygen,

• A.

Is Highly Flammable gas.

• B.

Is an Inert gas.

• C.

Is an explosive Gas

• D.

Is a gas that Supports Combustion

D. Is a gas that Supports Combustion
Explanation
Oxygen is a gas that supports combustion. This means that it is necessary for a fire to burn. Oxygen acts as an oxidizer, providing the necessary oxygen molecules for the combustion process to occur. Without oxygen, a fire cannot sustain itself and will eventually go out.

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• 5.

### What gas is given the symbol "CO"?

• A.

Methane

• B.

Carbon Dioxide

• C.

Carbon monoxide

• D.

Dinitrotetraoxide

C. Carbon monoxide
Explanation
Carbon monoxide is given the symbol "CO" because it consists of one carbon atom (C) and one oxygen atom (O). The symbol "CO" is derived from the chemical formula of carbon monoxide, which represents the ratio of atoms in the compound. Carbon monoxide is a colorless, odorless gas that is produced by the incomplete combustion of carbon-containing substances. It is highly toxic and can be lethal in high concentrations.

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• 6.

### What is the symbol for the gas Hydrogen Sulphide?

• A.

CO

• B.

CH4

• C.

H2S

• D.

CO2

C. H2S
Explanation
Hydrogen Sulphide is a compound composed of two elements, hydrogen (H) and sulphur (S). The symbol for hydrogen is H, and the symbol for sulphur is S. Therefore, the correct symbol for Hydrogen Sulphide is H2S.

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• 7.

### Converting a percentage to "parts per million" units, what would be the ppm for 0.04%?

• A.

4ppm

• B.

40ppm

• C.

400ppm

• D.

4000ppm

C. 400ppm
Explanation
To convert a percentage to "parts per million" (ppm), you multiply the percentage by 10,000. In this case, 0.04% multiplied by 10,000 equals 400ppm.

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• 8.

### What is the chemical symbol for Carbon Dioxide?

• A.

CO

• B.

CO2

• C.

C2H2

• D.

H20

B. CO2
Explanation
The chemical symbol for Carbon Dioxide is CO2. Carbon Dioxide is composed of one carbon atom (C) and two oxygen atoms (O), hence the chemical formula CO2.

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• 9.

### Oxides of Nitrogen (NOx) can be produced in the mine by:

• A.

Crushing of salt or stone.

• B.

Breathing, normal respiration.

• C.

Blasting operations.

• D.

Decomposing Organic matter.

C. Blasting operations.
Explanation
Blasting operations in mines can produce Oxides of Nitrogen (NOx) due to the high temperatures and pressures generated during the explosions. These conditions cause nitrogen and oxygen in the air to react and form NOx. Crushing of salt or stone, breathing, and decomposing organic matter do not involve the same extreme conditions required for the production of NOx.

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• 10.

### Normal/Fresh air is made up of:

• A.

79.04% Nitrogen, 20.93% Oxygen, 0.03% Carbon Monoxide and other gasses.

• B.

79.04% Oxygen, 20.93% Nitrogen, 0.03% Carbon Monoxide and other gasses.

• C.

79.04% Nitrogen, 20.93% Oxygen, 0.03% Methane and other gasses.

• D.

79.04% Nitrogen, 20.93% Oxygen, 0.03% Carbon Dioxide and other gasses.

D. 79.04% Nitrogen, 20.93% Oxygen, 0.03% Carbon Dioxide and other gasses.
Explanation
Normal/Fresh air is composed of various gases, with the majority being nitrogen (79.04%) and oxygen (20.93%). Carbon dioxide, although present in a small amount (0.03%), is also a component of normal air. Additionally, there are other gases present in normal air, but they are not specified in the answer.

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• Current Version
• Mar 20, 2023
Quiz Edited by
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• Apr 02, 2012
Quiz Created by
Mattj6660

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