One gas bleaches the colour of flowers by reduction while the other by oxidation.

Which of the following has the greatest reducing power?

The reaction of $HClO_3$ with $HCl$ gives a paramagnetic gas,which upon reaction with $O_3$ produces

Which of the following reactions does not take place?

Manganese dioxide on heating with concentrated hydrochloric acid gives a greenish yellow gas,$X$. With excess of ammonia,$X$ gives $Y$ and $Z$. $Y$ and $Z$ respectively are:

The reaction of fluorine with dilute $NaOH$ and concentrated $NaOH$ produces,respectively,........