Tutorial-2

TUTE SHEET- 2
PHASE RULE



1. State the Phase-Rule and describe following terminologies with as many as appropriate examples:
(a) Phase (b) Component (c) Degree of Freedom
(d) Metastable equilibrium (e) Eutectic Point (f) Congruent Melting Point
(g) Incongruent Melting Point (h) Cooling curves (i) Triple point
(j) Phase Diagrams. (k) Eutectic system and mixtures.

2. Derive Gibb’s Phase Rule.

3. Write a note on ‘reduced phase rule’.

4. With the help of neat and labeled Phase-diagram explain the following systems (considering Curves, Areas point and F)
(a) Water system
(b) Ag-Pb system
(c) Na – K system
(d) Zn – Mg system

5. Calculate the number of components and degree of freedom for the decomposition of NH4Cl.
NH4Cl(s) NH3(g) + HCl(g) ; PNH3 = PHCl

6. Discuss the merits and limitations of phase rule.

7. Calculate the number of components present in the following:
(a) CaCO3(s) CaO(s) + CO2(g)

(b) Ag(s) Ag-Pb solution (l) + Pb-Ag vapour (g)

(c) NH4Cl (s) xNH3 (q) + y HCl (g)

(d) Fe(s) + H2O (g) FeO(s) + H2 (g)