(a) Water at room temperature is a liquid because :-
Its particles tend to maintain the physical configuration in which it has comparatively more kinetic energy, so more movement as compared to solid particles while it has less intermolecular space and less kinetic energy, so less movement as compared to gaseous particles. As the particles of liquid are neither so close nor so far, hence they exhibit the property of fluidity. At room temperature its particles get the appropriate temperature and pressure to remain in liquid state. The freezing temperature and melting temperature of water is beyond 0°C and 100°C while the room temperature is 25°C, so the water is in liquid state.
(b) An iron almirah is a solid at room temperature because
The melting points of iron are very high which is 1538°C and this magnitude of temperature is much higher than the room temperature which is 25°C. So in room temperature the particles of iron tend to come closer such that they have the least intermolecular space and least kinetic energy for movement, as a result they are not able to overcome the forces of attraction leading to the slowing of their movement.