An element whose $IUPAC$ name is ununtrium $(Uut)$ belongs to

Arrange the hydrides of Group $15$ elements in the increasing order of their basic strength.

Which non-metal does not react with water but reacts with alkali?

Cyclic polymetaphosphates have the general formula $(PO_3)_n^{n-}$. Which of the following statements is true for the cyclic trimeric metaphosphate?

Match $List-I$ with $List-II$,match the gas evolved during each reaction.

$List-I$	$List-II$
$A$. $(NH_4)_2Cr_2O_7 \xrightarrow{\Delta}$	$I$. $H_2$
$B$. $KMnO_4 + HCl \rightarrow$	$II$. $N_2$
$C$. $Al + NaOH + H_2O \rightarrow$	$III$. $O_2$
$D$. $NaNO_3 \xrightarrow{\Delta}$	$IV$. $Cl_2$

Choose the correct answer from the options given below.

Which of the following statements regarding $N_2O_4$ is not correct?