Identify the statements which are not correct?
$(i)$ $ZnO, PbO, Sb_2O_3$ are neutral oxides.
(ii) $CO$ and $NO$ are amphoteric oxides.
(iii) $CrO_3, Mn_2O_7, V_2O_5$ are basic oxides.

The element having the electronic configuration $1s^2, 2s^2 2p^6, 3s^2 3p^1$ is

The periodic table consists of $18$ groups. An isotope of copper,on bombardment with protons,undergoes a nuclear reaction yielding element $X$ as shown below. To which group,element $X$ belongs in the periodic table?
${}_{29}^{83}Cu + {}_{1}^{1}H \rightarrow 6{}_{0}^{1}n + {}_{2}^{4}\alpha + 2{}_{1}^{1}H + X$

The correct order of acid strength is

Of the following pairs,the one containing an example of metalloid elements in the periodic table is:

Which of the following orders correctly represents the increasing acidic strength of the given acids?