The data on the gold–lead phase diagram are given below. Melting point of Au = 1063°C, Melting point of lead = 327°C. At 434°C, Au, liquid of 43 at.% Pb and Au2Pb are in equilibrium. At 253°C, Au2Pb, liquid of 74 at.% Pb and AuPb2 are in equilibrium. At 222°C, AuPb2, AuPb3 and liquid of 82 at.% Pb are in equilibrium. At 212°C, AuPb3, Pb and liquid of 84 at.% Pb are in equilibrium. Draw the phase diagram on a graph paper using a suitable scale. Write down the invariant reactions, giving the name of each.