The correct set that contains all kinds (basic, acidic, amphoteric, and neutral) of oxides is:

In the long form of the periodic table,the $d$-block element which forms an interstitial hydride is

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $R :$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy,when one moves from left to right in a period.
In the light of the above statements,choose the most appropriate answer from the options given below :

Among the oxides $SiO_2, SO_2, Al_2O_3$ and $P_2O_3$,the correct order of acidic strength is

Which of the following ions has a pseudo-noble gas electronic configuration?

Show by a chemical reaction with water that $Na_{2}O$ is a basic oxide and $Cl_{2}O_{7}$ is an acidic oxide.