Which of the following was used during First World War?

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Mustard gas. Mustard Gas ( C4H8Cl2S) is a yellow, oily, highly toxic, volatile liquid alkylating compound with a sweet to garlic like odour that evaporates to a poisonous gas. Mustard gas is a vesicant that was first used in chemical warfare in first world war. Exposure to this substance is corrosive to the eyes, skin and lungs and leads to blindness and blistering of the skin and can cause severe and sometimes fatal respiratory damage.

Which of the following was used during First World War?

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