Which reaction is not feasible?

The order of reactivity of $K$,$Mg$,$Zn$,and $Au$ with water is

What is the correct order of acidic strength for $Al_2O_3$,$SiO_2$,$P_2O_3$,and $SO_2$?

Use the periodic table to answer the following questions.
$(a)$ Identify an element with five electrons in the outer subshell.
$(b)$ Identify an element that would tend to lose two electrons.
$(c)$ Identify an element that would tend to gain two electrons.
$(d)$ Identify the group having metal,non-metal,liquid as well as gas at room temperature.

Which of the following is a metalloid?

Which of the following metals is the most electropositive (metallic) in nature?