(1)(a) State Avogadro’s law
(b) Which of the state of matter contains particles that are: (i) readily used
(ii) held firmly together by some forces of cohesion;
(iii) involved in rapid random motion?
Explanation
(a) Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain the same number of molecules.
(b)(i) Gaseous state (ii) Solid state (iii) Gaseous state.