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

Match the oxide given in column $A$ with its property given in column $B$.

Column $A$	Column $B$
$(i) \; Na_{2}O$	$(a) \; Neutral$
$(ii) \; Al_{2}O_{3}$	$(b) \; Basic$
$(iii) \; N_{2}O$	$(c) \; Acidic$
$(iv) \; Cl_{2}O_{7}$	$(d) \; Amphoteric$

Which of the following options has all correct pairs?

Which of the following is the most electropositive element?

What are the major differences between metals and non-metals?

Which of the following elements with the given electronic configurations belong to the same group?
$(i)$ $1s^2 2s^2$
$(ii)$ $1s^2 2s^2 2p^5$
$(iii)$ $1s^2 2s^2 2p^6 3s^2 3p^5$
$(iv)$ $1s^2 2s^2 2p^6 3d^{10} 4s^1$

$Br_2 + 2X^{-} \to 2Br^{-} + X_2$
$Cl_2 + 2Y^{-} \to 2Cl^{-} + Y_2$
The incorrect match regarding the above reactions is: