Statement 1: If a charged particle is moving on a circular path in a perpendicular magnetic field, the momentum of the particle does not change.

Statement 2: Velocity of charge particle does not change in the magnetic field.

When a charged particle is moving on a circular path in a magnetic field, the magnitude of velocity does not change but direction of velocity is changing every moment. Hence velocity is changing, so momentum $\left(\mathrm{m}\overrightarrow{\mathrm{v}}\right)$ is also changing.