Which of the following compounds is optically active?

Which one of the following halogens liberates oxygen,when passed through hot concentrated $KOH$ solution?

When $X$ amperes of current is passed through molten $AlCl_3$ for $96.5 \ s$,$0.09 \ g$ of aluminium is deposited. What is the value of $X$?

The sensitivity of a galvanometer is $60 \text{ division/A}$. When a shunt is used,its sensitivity becomes $10 \text{ division/A}$. If the galvanometer is of resistance $20 \ \Omega$,the value of shunt used is: (in $Omega$)

The megasporangium is equivalent to which structure in angiosperms?

Find the equivalent capacitance across $A$ and $B$ in $\mu F$.