Which of the following substances has the highest boiling point?

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.

The dominant mechanism for the motion of charge carriers in forward and reverse biased silicon $P-N$ junction are:

If $\frac{x^3 - 6x^2 + 10x - 2}{x^2 - 5x + 6} = f(x) + \frac{A}{(x - 2)} + \frac{B}{(x - 3)}$,then $f(x) =$ ?

Which of the following theories provides the latest explanation for the closure of stomata?

Which one of the following gives a yellow precipitate with iodine and $NaOH$ solution?