matter in our surroundings

a )   water at room temp is liquid because at room temp

1 intermolecular forces of attaraction is more the gas bt less then solid

2 kinetic energy of molecules is less then that of gas bt more then that of solid

so molecules r less compact n free to move within liquid

b iron is solid at room temp because in  iron at room temp

1 intermolecular fores r very high

2 kinetic energy of molecules is very less

so molecules r compactly packed n canvibrate at their mean positin only