Gases - Hydrogen

Question 1

What is the Chemical Symbol of Hydrogen

Answer 1

H2

Question 2

What is the specific gravity

Answer 2

0.07

Question 3

What is the Characteristics of Hydrogen

Answer 3

Colourless,
odourless and
tasteless

Question 4

Legal limit of Hydrogen

Answer 4

N/A

Question 5

Hydrogen effect on persons

Answer 5

Non-Toxic, but does not support life

Question 6

Is Hydrogen combustible?

Answer 6

Yes

Burns with a bluish flame in Air or O2 and forms water vapour as it burns. Oxygen nose point 5.1%

Question 7

Flammable limits of Hydrogen?

Answer 7

Explosive range is 4 to 75%

Question 8

Detection of Hydrogen?

Answer 8

GC

Question 9

Where is Hydrogen found in a mine?

Answer 9

Spontaneous Combustion, Mine Fires, behind seals, battery charging, reaction between acidic water and galvanised iron (pipes)
Can also be found in significant concentrations at the collar of stagnant boreholes, due to being lighter than air

Question 10

Is Hydrogen found in background concentrations?

Answer 10

Yes
Hydrogen is present in background concentrations in mines (ppm) due to its presence in air.
Increasing trends needs to be monitored as it’s an indicator for Spontaneous combustion.