$K_2Cr_2O_7 +$ conc. $H_2SO_4 + NaCl \rightarrow$ red orange vapours. Here red orange vapours are of :

Which of the following halides is inert towards hydrolysis at room temperature?

Which of the following statements is false?

Which of the following reacts with $H_2O$ to produce ozonised oxygen?

When treated with conc. $HCl$,$MnO_2$ yields a gas $(X)$ which further reacts with $Ca(OH)_2$ to generate a white solid $(Y)$. The solid $Y$ reacts with dil. $HCl$ to produce the same gas $X$. The solid $Y$ is

Explain why fluorine forms only one oxoacid,$HOF$.