General Principles and Processes of Isolation of Elements  MCQs

MCQs of General Principles and Processes of Isolation of Elements

Showing 31 to 40 out of 154 Questions
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31.
The value of equilibrium constant in spontaneous reaction is _____ .
(a) > 1
(b) < 1
(c) = 1
(d) = 0
Answer:

Option (a)

32.
Between which two functions, do Ellingham graphs show the relation ?
(a) ΔG° and T
(b) P and ΔS
(c) ΔG° and ΔH°
(d) ΔG° and P
Answer:

Option (a)

33.
On what does the selection of reducing agent depend in metallurgy ?
(a) ΔS° -ve
(b) ΔH° +ve
(c) ΔG° -ve
(d) ΔG° +ve
Answer:

Option (c)

34.
A sulphide ore is roasted before reduction. For this statement, which of the following options is not correct ?
(a) ΔfG° of CS2 and H2S is greater than ΔfG° of the ore.
(b) The value of ΔfG° is negative (-ve) for roasting.
(c) Roasting of sulphide containing ore is suitable from the view point of thermodynamics.
(d) Carbon and hydrogen are good reducing agents for sulphide containing ore.
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.
(a) At anode Cl2(g), at cathode H2(g) and in solution NaOH
(b) At anode Cl2(g), at cathode Na(s) and in solution NaOH
(c) At anode O2(g), at cathode H2(g)
(d) At anode H2(g), at cathode Cl2(g) and in solution NaOH
Answer:

Option (a)

36.
Zone refining is used to produce very pure _____ .
(a) Si
(b) Na
(c) Cu
(d) Zn
Answer:

Option (a)

37.
By which method oxygen and nitrogen present in the form of impurities in zirconium are removed ?
(a) van Arkel
(b) Roasting
(c) Liquation
(d) Distillation
Answer:

Option (a)

38.
Which method of purification is indicated by the following equation ?

Ti(s) + 2I2(g) →523 K TiI4(g) →1700 K Ti(s) + 2I2(g)

(a) van Arkel
(b) Zone refining
(c) Poling
(d) Mond Carbonyl
Answer:

Option (a)

39.
What solid substance is used as an adsorbent in column chromatography ?
(a) Al2O3
(b) CaCO3
(c) TiO2
(d) Filter paper
Answer:

Option (a)

40.
During purification by van Arkel method, metal is converted into _____ .
(a) stable volatile compound
(b) unstable volatile compound
(c) stable non-volatile compound
(d) All of the above
Answer:

Option (b)

Showing 31 to 40 out of 154 Questions
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