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Free download in PDF Chemical Technology General Knowledge Multiple Choice Questions(MCQs) with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
Quicklime is
[A]
Ca(OH)2
[B]
CaCO3
[C]
CaO
[D]
NaOH
62
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
63
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)
Answer: C(s) + O2 (g) ? CO2(g)
64
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
Answer: limestone and bauxite
65
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
Answer: calcium aluninates and silicates of varying compositions
66
Limestone is predominantly
[A]
magnesium carbonate
[B]
sodium carbonate
[C]
calcium carbonate
[D]
potassium carbonate
Answer: calcium carbonate
67
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
Answer: solids density 1.91 and bulk density 1.0
68
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
Answer: limestone brine and coal
69
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
70
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
Answer: require less initial investment for the same capacity
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