$NaCl$ (solid) $+ K_2Cr_2O_7$ (solid) $+$ conc. $H_2SO_4 \xrightarrow{\text{warm}} X$. Reddish brown fumes of $X$. The oxidation state of central atom in compound $X$ is

Match the following molecules with their respective colours:

$A$. $F_2$	$I$. Red
$B$. $Cl_2$	$II$. Violet
$C$. $Br_2$	$III$. Yellow
$D$. $I_2$	$IV$. Greenish yellow

On heating,chloric acid $(HClO_{3})$ decomposes to:

Given below are two statements: Statement $(I)$: Oxidising power of halogens decreases in the order $F_2 > Cl_2 > Br_2 > I_2$,which is the basis of "Layer test". Statement $(II)$: "Layer test" to identify $Br_2$ and $I_2$ in aqueous solution involves the oxidation of bromide or iodide into $Br_2$ or $I_2$ respectively with $Cl_2$,which is a type of displacement redox reaction. In the light of the above statements,choose the correct answer from the options given below:

Deacon's process is used in the manufacture of

When $KBr$ is treated with conc. $H_2SO_4$,a reddish-brown gas is evolved. The evolved gas is: