General Principles and Processes of Isolation of Elements  MCQs

MCQs of General Principles and Processes of Isolation of Elements

Showing 121 to 130 out of 154 Questions
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121.
Which of the processes is used in thermite welding ?
(a) TiO2+4Na →Ti + 2Na2O
(b) 2Al + Fe2O3 →Al2O3+ 2Fe
(c) SnO2+ 2C → Sn + 2CO
(d) Cr2O3+ 2Al → Al2O3+ 2Cr
Answer:

Option (d)

122.
The following purification method is known as_____ Ti + 2I2 →TiI4 →∆ Ti + 2I2
(a) Zone-refining
(b) Poling
(c) Cupellation
(d) Van-Arkel method
Answer:

Option (d)

123.
Which of the following pairs of metals is purified by Van-Arkel method.
(a) Ga and In
(b) Zr and Ti
(c) Ag and Au
(d) Ni and Fe
Answer:

Option (b)

124.
Oxidation states of the metal in the minerals haematite and magnetite, respectively, are _____
(a) II, III haematite and III in magnetite
(b) II, III in haematite and II in magnetite
(c) II, in haematite and II, III in magnetite
(d) III in haematite and II, III in magnetite
Answer:

Option (d)

125.
In a view of the sign of ∆G∘ for the following reactionsPbO2 + Pb → 2PbO; ∆G∘ < 0SnO2 + Sn → 2SnO; ∆G∘ > 0Which oxidation states are more characteristic for lead and tin ?
(a) For lead +2, for tin +2
(b) For lead +4, for tin +4
(c) For lead +2, for tin +4
(d) For lead +4, for tin +2
Answer:

Option (c)

126.
What is the molecular formula of kaolinite ?
(a) [Al2(OH)4Si2O5]
(b) [Al2(OH)4Si2O8]
(c) [Al2(OH)3Si2O5]
(d) [Al3(OH)4Si2O6]
Answer:

Option (a)

127.
Which metal is in combined form in heamoglobin ?
(a) Zn
(b) Mg
(c) Cu
(d) Fe
Answer:

Option (d)

128.
Which of the following statements is correct for concentration of ore ?
(a) Separation is done on the basis of the principle of relative density of ore and gangue.
(b) Magnetic separation method for concentration of ore containing sulphide.
(c) Froth floataion process is used for concentration of ore of iron.
(d) All of given.
Answer:

Option (a)

129.
Which of the following is Gibbs-Helmholtz equation ?
(a) ΔG = ΔH - TΔS
(b) ΔG = ΔH + TΔS
(c) ΔG = +RT/ nQc
(d) -ΔG = ΔH - TΔS
Answer:

Option (a)

130.
Give the equation showing relation between ΔG° and ΔE°cell.
(a) ΔG° =+ nFE°cell
(b) ΔG° =- nFE°cell
(c) ΔG° = RT/nE°cell
(d) ΔG° = - RT/nE°cell
Answer:

Option (b)

Showing 121 to 130 out of 154 Questions
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