In which state does the element phosphorus exist at room temperature?

Which of the following is a noble metal?

Name two metals in each of the following cases:
$(i)$ Metals that are stored in kerosene.
$(ii)$ Metals that are alloyed with iron to make stainless steel.
$(iii)$ Metals which are highly malleable and ductile.

$(a)$ Why does calcium start floating when added to water?
$(b)$ Most metals do not release hydrogen gas when reacting with nitric acid. Why?
$(c)$ Write the chemical equation for the reaction of iron with steam. Name the compound of iron obtained.

By which method/process is sulphur obtained from the earth's crust?

Which of the following is $NOT$ the correct order of reactivity of metals?