Conc. $H_2SO_4$ cannot be used to prepare $HBr$ from $NaBr$ because it :

Which of the following halogens exhibits metallic character?

The gas evolved on heating $CaF_2$ and $SiO_2$ with concentrated $H_2SO_4$,on hydrolysis gives a white gelatinous precipitate. The precipitate 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

Which of the following decreases down the halogen group?

Select the correct set of species which cannot react with water but react with $NaOH$:
$(i) \, NO_2$ $(ii) \, P_4$ $(iii) \, Al$ $(iv) \, I_2$