1- On the gravimetric determination of Ca2+ ! the most satisfactory form (being
nonhygroscopicl to be weighed is:
A. CaCO3 B. CaO C. CaC2O4.H2O D. CaC2O4
2. The following is not a form of "co-precipitation":
A. Occlusion. B. Inclusion. C. Post precipitation. D. Surface adsorption.
3- For optimal precipitation process, requirements are:
A. High "relative super saturation". B. High rate of "nucleation".
C. Formation of large number of fine crystals. D. Formation of small number of large crystals.
4- During the formation of BaSO4 crystals! "non-isomorphic inclusion" may be caused by:
A. PbSO4 B. K2SO4 C. Ba(NO3)2 D. BaCl2
5- The most efficient method for treatment of occlusion is:
A. Washing. B. Digestion C. Reprecipitation D. All are equivalent.