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Chemical Process

Chemical Process
Commercial production of calcium carbide requires limestone and __________ as raw materials.

Soda ash
Fuel oil
Sand
Coke

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Chemical Process
Cement mainly contains

CaO, MgO, K₂O
MgO, SiO₂, K₂O
Al2O₃, MgO, FE₂O₃
CaO, SiO₂, Al2O₃

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Chemical Process
Which of the following is not a pyrite ore?

Galena
Celestite
Siderite
Gypsum

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Chemical Process
Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.

98
25
10
50

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Chemical Process
In the Lurgi coal gasifier

Entrainment of solids is higher
Low carbon conversion efficiency is achieved
Large quantity of coal can be processed
Coking coals cannot be used

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Chemical Process
Chemical formula of oleum is

H₂SO₇
H₂S₂O₇
H₂SO₃
H₂SO₄

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