Chloroethane reacts with $X$ to form diethyl ether. What is $X$?

The uncertainties in the velocities of two particles $A$ and $B$ are $0.05 \ m/s$ and $0.02 \ m/s$ respectively. The mass of $B$ is five times that of mass $A$. What is the ratio of uncertainties $\left(\frac{\Delta x_A}{\Delta x_B}\right)$ in their positions?

When radiation of wavelength $\lambda$ is incident on a metallic surface,the stopping potential is $4.8 \ V$. If the same surface is irradiated with radiation of wavelength $2\lambda$,the stopping potential is $1.6 \ V$. The threshold wavelength for the metal is:

When a capacitor is connected in series to an $LR$ circuit,the alternating current flowing in the circuit

What is the value of $n-$factor of $[Fe(CN)_6]^{-4}$ in the given reaction?
$[Fe(CN)_6]^{-4} \xrightarrow{MnO_4^- / H^{+}} Fe^{+3} + CO_2 + NO_3^-$

Which of the following aspects is a defining characteristic of living organisms?