Which of the following represents the correct order of acidic strength?

When $KI$ is passed through a solution containing $KCl, KF,$ and $KBr$,what happens?

The correct order of increasing metallic character of $Na$, $Be$, $P$, $Mg$ and $Si$ is:

Statement $I :$ Acid strength increases in the order given as $HF < HCl < HBr < HI$.
Statement $II :$ As the size of the elements $F, Cl, Br, I$ increases down the group,the bond strength of $HF, HCl, HBr$ and $HI$ decreases and so the acid strength increases.
In the light of the above statements,choose the correct answer from the options given below.

If an electron is transferred from $B$ to $A$,then the reaction is possible when:

The elements $X$,$Y$,$Z$,and $T$ have the indicated electronic configurations. Starting with the innermost shell,which is the most metallic element?