OCTCO/OCTF Exit Exam • Set 7 Question 20 of 30

Pyrophoric iron sulphide is formed:

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Direct Answer

Option D: All of the above

Pyrophoric iron sulphide forms inside crude tanks when iron rust (iron oxide) reacts with hydrogen sulphide (H2S) in an oxygen-depleted atmosphere.

All Options

In the presence of oxygen

In presence of H2S

When rust is formed in tanks

All of the above (Correct Answer)

Detailed Explanation & Context

Pyrophoric iron sulphide forms inside crude tanks when iron rust (iron oxide) reacts with hydrogen sulphide (H2S) in an oxygen-depleted atmosphere.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).

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