In which of the following properties do the two enantiomers of lactic acid differ from each other?

If $x \sqrt{1+y}+y \sqrt{1+x}=0$, then $\frac{d y}{d x}$ is equal to

$A$ satellite is revolving very close to a planet of density $\rho$. The period of revolution of the satellite is

Which statement is wrong for viruses?

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.

Which of the following is an azo dye?