In the following,the element with the highest electropositivity is

Which of the following oxides is the most acidic?

Given below are two statements :
Statement $I$ : An element in the extreme left of the periodic table forms acidic oxides.
Statement $II$ : Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.
In the light of the above statements,choose the correct answer from the options given below :

Which of the following sets of elements have the strongest tendency to form anions?

Which pair of elements has the same number of electrons in their valence shell$:-$

Which of the following will liberate bromine from a potassium bromide solution?