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What is the most accurate description of Hydrogen Sulfide (H₂S)?

A green, harmless gas with a sweet smell.

A colorless, highly toxic, and flammable gas.

A heavy gas that rises quickly in the air.

A solid compound found only in laboratories.

Why is H₂S called the "silent killer"?

It has no odor at any concentration.

It is invisible and can paralyze your sense of smell at high concentrations.

It only affects people while they are sleeping.

It makes no sound when it leaks.

Where is H₂S commonly found?

Only in chemical laboratories.

In outdoor, open, windy areas.

Oil and gas operations, sewers, wastewater plants, and confined spaces.

At high altitudes in the atmosphere.

H₂S is heavier than air. What is a critical safety implication of this?

It will quickly rise and disperse.

It tends to accumulate in low-lying, confined, or poorly ventilated areas.

It mixes evenly with air, posing an equal risk everywhere.

It becomes lighter when mixed with water.

None

H₂S is flammable. What is its Lower Explosive Limit (LEL)?

1.0% (10,000 ppm)

4.0% (40,000 ppm)

19.5% (195,000 ppm)

44.0% (440,000 ppm)

None

How does H₂S primarily enter the body and cause harm?

Through skin absorption.

By ingestion (swallowing).

Through inhalation, causing chemical asphyxiation.

By contact with the eyes only.

None

What is "Olfactory Fatigue"?

The pleasant smell of H₂S at low levels.

The ability to smell H₂S better over time.

The paralysis of the sense of smell at concentrations around 100 ppm, making you unable to detect the gas.

A medical condition caused by smelling too many rotten eggs.

None

According to ACGIH best practices, what is the 8-hour Time-Weighted Average (TWA) exposure limit for H₂S?

5 ppm

10 ppm

1 ppm

20 ppm

None

What is the OSHA PEL-Ceiling limit for H₂S that must not be exceeded at any time?

1 ppm

10 ppm

20 ppm

100 ppm

None

At approximately what concentration does H₂S cause rapid loss of consciousness ("knockdown")?

10 ppm

100 ppm

500 – 700 ppm

>1000 ppm

None

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