Hot concentrated sulphuric acid,on reaction with which one of the following elements,produces two gaseous products?

Match the corresponding entries of Column-$I$ with Column-$II$. (Where $m$ is the magnification produced by the mirror)

Total internal reflection of light is possible when light enters from

If $f: R \rightarrow R$ and $g: R \rightarrow R$ are defined by $f(x)=|x|$ and $g(x)=[x-3]$ for $x \in R$,then $\{g(f(x)):-\frac{8}{5} < x < \frac{8}{5}\}$ is equal to

Which artery is absent in a frog?

If a plant is deficient in the element $Zinc$,which plant hormone's biosynthesis will be affected in that plant?