Which of the following is a non metal that remains liquid at room temperature?

Which of the following is a non metal that remains liquid at room temperature?

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1) Marsh gas is

2) The vast resources of unutilised natural gas can be used in the production of

3) Which of the following metals remain in liquid for under normal conditions?

4) The group of metals Fe, Co, Ni may best called as

5) The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of