Which of the following oxides does not react with $NaOH$ as well as with $HCl$?

$STATEMENT-1$: $Pb^{4+}$ compounds are stronger oxidizing agents than $Sn^{4+}$ compounds.
$STATEMENT-2$: The higher oxidation states for the group $14$ elements are more stable for the heavier members of the group due to 'inert pair effect'.

Give a brief account of the production of cement and write its properties and uses.

With respect to graphite and diamond,which of the statement$(s)$ given below is (are) correct?
$(A)$ Graphite is harder than diamond.
$(B)$ Graphite has higher electrical conductivity than diamond.
$(C)$ Graphite has higher thermal conductivity than diamond.
$(D)$ Graphite has higher $C-C$ bond order than diamond.

Which of the following halides is the most stable?

$A$ black sulphide precipitate when treated with ozone becomes white. The white compound is: