31. |
The value of equilibrium constant in spontaneous reaction is _____ .
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Answer:
Option (a) |
32. |
Between which two functions, do Ellingham graphs show the relation ?
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Answer:
Option (a) |
33. |
On what does the selection of reducing agent depend in metallurgy ?
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Answer:
Option (c) |
34. |
A sulphide ore is roasted before reduction. For this statement, which of the following options is not correct ?
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Answer:
Option (d) |
35. |
Which of the following products is obtained during electrolysis of concentrated solution of NaCl in presence of graphite’s inert electrode.
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Answer:
Option (a) |
36. |
Zone refining is used to produce very pure _____ .
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Answer:
Option (a) |
37. |
By which method oxygen and nitrogen present in the form of impurities in zirconium are removed ?
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Answer:
Option (a) |
38. |
Which method of purification is indicated by the following equation ?
Ti(s) + 2I2(g) TiI4(g) Ti(s) + 2I2(g)
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Answer:
Option (a) |
39. |
What solid substance is used as an adsorbent in column chromatography ?
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Answer:
Option (a) |
40. |
During purification by van Arkel method, metal is converted into _____ .
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Answer:
Option (b) |