What is the atomic number of sulphur?

Which alloy is used to make surgical instruments?

Which among the following statements is incorrect for magnesium metal?

Name any one metal which reacts neither with cold water nor with hot water but reacts with heated steam to produce hydrogen gas.

$(a)$ Write the chemical name of the coating that forms on silver and copper articles when these are left exposed to moist air.
$(b)$ Explain what is galvanisation? What purpose is served by it?
$(c)$ Define an alloy. How are alloys prepared? How do the properties of iron change when:
$(i)$ small quantity of carbon,
$(ii)$ nickel and chromium are mixed with it.

Which metal is stored in kerosene?