Concentrated $H_2SO_4$ cannot be used to prepare $HBr$ from $NaBr$,because it

Chlorine gas reacts with red hot calcium oxide to give

Which of the following substances act as a fluorinating agent?

Which of the following fluorides can react with fluorine?

Find out which of the following statements are true or false:
$(a)$ Number of $S-S$ bonds in $H_2S_nO_6$ is $(n-1)$.
$(b)$ When $F_2$ reacts with $H_2O$,it forms $HF$,$O_2$,and $O_3$.
$(c)$ $XeF_6$ on hydrolysis shows a disproportionation reaction.
$(d)$ $Al$ metal on reacting with dilute $NaOH$ gives a white precipitate of $Al(OH)_3$ as a final product.

$Fluorine$ does not form positive oxidation states because