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61.

Compared to mercury electrolytic cells diaphragm electrolytic cells

A.	consume less power per ton of chlorine produced	B.	require less initial investment for the same capacity
C.	can produce 70% NaOH solution	D.	uses saturated NaCI solution with solid NaCI make-up

62.

Solvay process for the manufacture of soda ash

A.	can use low-grade brine	B.	requires less electric power than the modified Solvay process
C.	does not require NH3 plant investment	D.	all of the above

63.

The principal raw materials for the manufacture of soda ash by Solvay process are

A.	limestone and potassium chloride	B.	dolomite and sodium hydroxide
C.	limestone brine and coal	D.	coal and caustic soda

64.

Glass industry requires soda ash with

A.	solids density 1.91 and bulk density 1.0	B.	solids density 1.86 and bulk density 0.6
C.	solids density 1.80 and bulk desity 0.58	D.	none of the above

65.

Limestone is predominantly

A.	magnesium carbonate	B.	sodium carbonate
C.	calcium carbonate	D.	potassium carbonate

66.

Portland cement is a finely ground

A.	calcium aluninates and silicates of varying compositions	B.	calcium aluminates and sodium silicates of varying compositions
C.	calcium aluminates and caustic soda	D.	calcium silicates and gypsum of fixed composition

67.

High alumina cement is manufactured by fusing

A.	limestone and slaked lime	B.	limestone and quick lime
C.	limestone and bauxite	D.	limestone and sand

68.

Which of the following reactions is an exothermic reaction?

A.	CaCO3(s) ? CaO(s) + CO2(g)	B.	CaO(s) + H2O(I) ? Ca(OH)2(s)
C.	2NaHCO3 (s) ? Na2CO3(s) + CO2(g) + H2O(g)	D.	C(s) + O2 (g) ? CO2(g)

69.

The temperature in the calcining zone of a vertical shaft kiln used in the manufacture of quicklime is about

A.	400?C	B.	275?C
C.	550?C	D.	1000?C

70.

Quicklime is

A.	Ca(OH)2	B.	CaCO3
C.	CaO	D.	NaOH