General Principles and Processes of Isolation of Elements  MCQs

MCQs of General Principles and Processes of Isolation of Elements

Showing 131 to 140 out of 154 Questions
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131.
Mention the relation between E°cell and equilibrium constant.
(a) Ecell0=RTnF lnK
(b) Ecell0=-RTnF lnK
(c) Ecell0=RtnF lnK
(d) Ecell0=nFRT lnK
Answer:

Option (b)

132.
Under which conditions, the reaction will be spontaneous ?
(a) Values of E° and ΔG° negative.
(b) Values of E° and ΔG° positive.
(c) E° positive and ΔG° negative.
(d) E° negative and ΔG° positive.
Answer:

Option (c)

133.
Which complex is formed when Ag is reacted with NaCN ?
(a) [Ag(CN)2]2-
(b) [Ag(CN)2]-
(c) [Ag(CN)]-
(d) [Ag(CN)3]-
Answer:

Option (b)

134.
2[Au(CN)2]-(aq) + Zn(s) → x + 2Au(s) , Find x.
(a) [Zn(CN)2]2-
(b) [Zn(CN)4]-
(c) [Zn(CN)4]2-
(d) [Zn(CN)2]-
Answer:

Option (c)

135.
By which name the process of preparing nickle carbonyl complex from impure nickle metal is known ?
(a) Han's carbonyl method
(b) Arkel method
(c) Mond carbonyl method
(d) Hinsberg method
Answer:

Option (c)

136.
Which is the layer in the inner side of iron vessel in the method of obtaining pure Al from alumina ?
(a) Steel
(b) Aluminium
(c) Graphite
(d) Copper
Answer:

Option (c)

137.
Which ore is mainly used in the extraction of copper metal ?
(a) Copper glance
(b) Cuprite
(c) Copper pyrites
(d) Malachite
Answer:

Option (c)

138.
In Bessemer process of obtaining copper, what is added to Cu2S ?
(a) Powder of Zn
(b) Powder of Al
(c) Sand
(d) Powder of Fe
Answer:

Option (c)

139.
In the process of Bessemerisation, which metal pairs are present in trace proportion in copper obtained ?
(a) Zn, Si, As, Bi, Au, Pt, Sb
(b) Zn, Mg, Ag, Bi, Pt, Au, C
(c) Au, Zn, Si, Ag, Bi, Mg, C
(d) Zn, Si, Pt, p, Sb, C, Au
Answer:

Option (a)

140.
At which high temperature pig iron is formed ?
(a) 2170 K
(b) 1200 K
(c) 2100 K
(d) 1270 K
Answer:

Option (a)

Showing 131 to 140 out of 154 Questions
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