Engineering :: Chemical Technology

@ : Home > Chemical Engineering > Chemical Technology

71.

Slaked lime is

A.	NaOH	B.	KOH
C.	Ca(OH)2	D.	CaO

72.

Slaked lime is produced by

A.	hydrogenation of quicklime	B.	hydration of quicklime
C.	dehydration of quicklime	D.	dehydrogenation of quicklime

73.

Plaster of Paris is

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

74.

Clinker is the mass obtained by heating

A.	powdered limestone and clay	B.	gypsum
C.	dolomite	D.	sand limestone and washing soda

75.

The process of setting cement under water is essentially

A.	an oxidation process	B.	a reduction process
C.	a double decomposition process	D.	a hydration process

76.

The setting of plaster of Paris takes place with

A.	loss of CO2	B.	hydrolysis
C.	hydration	D.	dehydration

77.

Gypsum is added to clinker during cement manufacture to

A.	decrease the rate of setting of cement	B.	make the cement impervious
C.	bind the particles of calcium silicate	D.	to facilitate the formation of colloidal gel

78.

Plaster of paris is obtained by heating

A.	limestone to 120-130?C	B.	soda ash to 120-130?C
C.	dolomite to 120-130?C	D.	gypsum to 120-130?C

79.

Sodium bicarbonate is an important constituent of

A.	caustic soda	B.	washing soda
C.	baking powder	D.	baking soda

80.

Which of the following is not an explosive?

A.	Calcium ammonium nitrate	B.	Nitroglycerine
C.	Trinitrotoluene	D.	Cellulose nitrate