Explanation:

Only statement 1st is correct.

White Phosphorus

• Global human rights organisations Amnesty International and Human Rights Watch have recently accused the Israel Defense Forces (IDF) of using white phosphorus munitions in Gaza and Lebanon.

• White phosphorus is a pyrophoric that ignites when exposed to oxygen, producing thick, light smoke as well as intense 815-degree Celsius heat.

• Pyrophoric substances are those which ignite spontaneously or very quickly (under 5 minutes) when in contact with air.

• It is a toxic substance produced from phosphate-containing rocks.

• It is among the most unstable of pyrophoric substances that emits a distinct garlic-like odour and it can release into indoor air as smoke.

• Irish nationalists in the late 19th century first used white phosphorus munitions, in a formulation that became known as “Fenian fire”.

• White phosphorus munitions are not under a blanket ban, though their use is regulated under the International Humanitarian Law (IHL).

• It is not considered a chemical weapon because its operational utility is primarily due to heat and smoke, rather than toxicity.

• The use of White phosphorus munitions is governed under the Protocol III by the Convention on Conventional Weapons (CCW).

Hence option 1st is correct.