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71.

Grinding cost is maximum when

A.	phosphate rock is ground to -200 mesh	B.	phosphate rock is ground to -150 mesh
C.	phosphate rock is ground to -100 mesh	D.	phosphate rock is ground to -20 mesh

72.

If the reactor temperature is wet process (strong sulphuric acid leaching) for the manufacture of orthophosphoric acid is kept about 100?C

A.	undesirable CaSO4.	B.	pyrophosphoric acid is formed
C.	metaphosphoric acid is formed	D.	none of these answers

73.

In wet process (strong sulphuric acid leaching) for the manufacture of orthophosphoric acid the dilute orthophoric acid (40%) is obtained from travelling pan vacuum filter. The dilute orthophosphoric acid (50%) is concentrated economically 75% orthophosphoric acid by using

A.	an evaporator	B.	a distillation column
C.	an extractor	D.	an adsorption column

74.

Pyrophosphoric acid can be made by heating the orthophosphoric acid to

A.	100?C	B.	250?C
C.	900?C	D.	1400?C

75.

Metaphosphoric acid can be made by heating the orthophosphoric acid to about

A.	250?C	B.	500?C
C.	900?C	D.	1500?C

76.

In wet process (strong sulphuric acid leaching for the manufacture of orthophosphoric acid a by-product obtained is

A.	CaSO4.1	B.	CaSO4.2H2O
C.	CaSO4.	D.	CaSO4

77.

The chemical formula of gypsum is

A.	CaSO4	B.	CaSO4.H2O
C.	CaSO4.2H2O	D.	CaSO4.

78.

Gypsum can be converted to ammonium sulphate by reacting with

A.	ammonium carbonate	B.	ammonia
C.	nitric acid	D.	soda ash

79.

In wet process (Hydrochloric acid leaching) for the manufacture of orthophosphoric acid solvent used for the extraction of H3PO4 from CaCI2 solution is

A.	benzene	B.	butanol
C.	methyl ethyl ketone	D.	hexane

80.

Select the wrong statement

A.	For the manufacture of H3PO4 wet process (strong sulphuric acid leacing) uses high grade phosphate rock whereas in electric furnace process low grade phosphate rock can also be used	B.	For the manufacture of H3PO4 the capital investment of the plant in electric furnace process is higher as compared to wet process (strong sulphuric acid leaching)
C.	For the manufacture of H3PO4 electric furnace process produces high purity acid	D.	Gypsum is a by-product of wet process (Hydrochloric acid leaching) for the manufacture of H3PO4