Which of the following statements is incorrect regarding saline hydrides?

$A$ semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z = 33)$. $A$ second semiconductor $Y$ is made by doping germanium with indium $(Z = 49)$. The two are joined end to end and connected to a battery as shown. Which of the following statements is correct?

It includes multicellular,aquatic or terrestrial,photosynthetic eukaryotic organisms.

Which one of the following cell organelles is enclosed by a single membrane?

Chlorine atom,in its third excited state,reacts with fluorine to form a compound $X$. The formula and shape of $X$ are :

In the following common emitter circuit,if $\beta = 100$,$V_{CE} = 7 \text{ V}$,$V_{BE} = 0 \text{ V}$ (negligible),and $R_C = 2 \text{ k}\Omega$,then find $I_B$ in $\text{mA}$.