In $s-$block,on moving down the group,the reactivity of metals with water and air increases. Which of the following factors has no significance for this trend of reactivity?

What is the correct order with respect to metallic property of $Zr, Cd, Sn, Sr$?

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?

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 :

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

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