Question

1. Which separation technique will you apply for the separation of the
following?
i) Sodium chloride from its solution in water
ii) Butter from curd
iii) Camphor from salt.
iv) Oil from water
v) Tea leaves from tea
vi) Ammonium chloride from a mixture containing sodium
chloride & ammonium chloride.
c​

Answer 1

Answer:

a. evaporation

b.centrifugation

c.sublimation

d.filtration

e.filtration

f.sublimation

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Answer 2

Answer:

A lone electron pair of the phosphoryloxy on the neutral phosphorus extractants () coordinates with the rare-earth ions in the neutral complex of rare earths to form neutral coordinating extraction complex; the extraction reaction of nitrate rare earths is expressed as below:

(2.93)

TBP in the equation could be P350, etc. or other neutral phosphorus-oxygen extractants. The extraction reaction of Ce4 + for TBP is

(2.94)

The coordination number of Ce here is 10.

Wang et al. [88] studied the extraction complex of P350 and rare-earth ions by using the methods