PSSR Exit Exam • Set 5 Question 19 of 30
What is the primary danger associated with hydrogen sulfide (H2S) gas in cargo tanks or sewage systems?
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Direct Answer
Option A: It is highly toxic, paralyzes the sense of smell instantly at high ppm, and is flammable
H2S is an extremely deadly toxic gas produced by decomposing organic matter or sour crude oil. It deadens olfactory nerves quickly, causing collapse and death.
All Options
A
It is highly toxic, paralyzes the sense of smell instantly at high ppm, and is flammable
(Correct Answer)
B
It supports combustion without flame
C
It is odorless and heavier than air but completely non-toxic
D
It causes immediate skin freezing
Detailed Explanation & Context
H2S is an extremely deadly toxic gas produced by decomposing organic matter or sour crude oil. It deadens olfactory nerves quickly, causing collapse and death.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Personal Safety & Social Responsibilities (PSSR).
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