Which of the following is paramagnetic?

The extent of charge of a lead accumulator is determined by

The $pH$ of $0.05 \ M$ acetic acid is $(K_a = 2 \times 10^{-5})$

Which one of the following is a matching set of phylum and its three examples?

If $dx + dy = (x + y)(dx - dy)$,then $\log(x + y)$ is equal to

In a mass spectrometer used for measuring the masses of ions,the ions are initially accelerated by an electric potential $V$ and then made to describe semicircular paths of radius $R$ using a magnetic field $B$. If $V$ and $B$ are kept constant,the ratio $\left( \frac{\text{charge on the ion}}{\text{mass of the ion}} \right)$ will be proportional to