Which of the following sets has the highest tendency to form anions?

Which of the following substances will liberate bromine when reacted with a solution of potassium bromide?

In the periodic table,metallic character of the elements shows one of the following trends:

Which of the following pairs has elements containing the same number of electrons in the outermost orbit?

Which of the following is the most electropositive element?

With the help of the following reactions,arrange the metals $A$,$B$,$D$,and $E$ in decreasing order of their reactivity:
$(I)$ $B + ANO_3 \longrightarrow BNO_3 + A$
$(II)$ $A + HCl \longrightarrow ACl + \frac{1}{2} H_2$
$(III)$ $D + ECl \longrightarrow DCl + E$
$(IV)$ $D + HNO_3 \longrightarrow$ $H_2$ gas is not evolved