Which of the following enzymes is not useful for the digestion of proteins?

For the reaction $SnO_{2(s)} + 2H_{2(g)} \rightleftharpoons 2H_2O_{(g)} + Sn_{(l)}$,calculate $K_p$ at $900 \ K$ where the equilibrium steam-hydrogen mixture was $45\%$ $H_2$ by volume.

Cornea transplant in humans is almost never rejected. This is because

The magnifying power of a telescope with tube length $60 \ cm$ is $5$. Then the focal length of its eyepiece is: (in $cm$)

Write the resonance structures for $SO_{3}$,$NO_{2}$,and $NO_{3}^{-}$.

Silk, honey, and lac are: