Engineering :: Chemical Technology
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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 |
Answer: Option B
Explanation:
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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 |
Answer: Option D
Explanation:
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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 |
Answer: Option C
Explanation:
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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 |
Answer: Option A
Explanation:
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65. |
Limestone is predominantly |
A. |
magnesium carbonate |
B. |
sodium carbonate |
C. |
calcium carbonate |
D. |
potassium carbonate |
Answer: Option C
Explanation:
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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 |
Answer: Option A
Explanation:
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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 |
Answer: Option C
Explanation:
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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) |
Answer: Option D
Explanation:
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69. |
The temperature in the calcining zone of a vertical shaft kiln used in the manufacture of quicklime is about |
Answer: Option D
Explanation:
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70. |
Quicklime is |
Answer: Option C
Explanation:
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