General Principles and Processes of Isolation of Elements  MCQs

MCQs of General Principles and Processes of Isolation of Elements

Showing 61 to 70 out of 154 Questions
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61.
What is the pH value of the remaining brine (sea water) after Cl2 is obtained from it ?
(a) < 7
(b) = 7
(c) > 7
(d) ≤ 7
Answer:

Option (c)

62.
What is the complex obtained when gold is leached with KCN ?
(a) [Au(CN)4]-2
(b) [Au(CN)2]-
(c) [Au(CN)2]
(d) [Au(CN)6]-4
Answer:

Option (b)

63.
What is the common name and IUPAC name of Na[Al(OH)4] ?
(a) Sodium alumina, sodium tetrahydroxo aluminate (III).
(b) Sodium aluminate, sodium tetrahydroxo aluminate (III).
(c) Sodium meta aluminate, sodium tetrahydroxo aluminate (III).
(d) Sodium aluminate, sodium tetrahydroxo aluminium (III).
Answer:

Option (b)

64.
Select the correct order of the steps in dry metallurgy.
(a) Refining, Bessemerization, Smelting
(b) Roasting, Smelting, concentration
(c) Concentration, Roasting, Smelting
(d) Bessemerization, Refining, Smelting
Answer:

Option (c)

65.
Read the following statement and choose the correct option. (1) Alnico and aluminium bronze are used in preparation of parts of the aeroplanes. (2) Copper is used in the preparation of tubes of boiler, Delta metal and Muntz metal. (3) Copper and aluminium form alloys like duralumin and aluminium bronze. (4) Copper and zinc are used in the preparation of German silver.
(a) TFTT
(b) TTFT
(c) TFFT
(d) TFTF
Answer:

Option (b)

66.
Which of the following reaction does not occur in the blast furnace in the temperature range of 500-800 K ?
(a) 3Fe2O3 + CO → 2Fe3O4 + CO2
(b) Fe3O4 + CO → 3FeO + CO2
(c) FeO + CO → Fe + CO2
(d) Fe2O3 + CO → 2FeO + CO2
Answer:

Option (c)

67.
Four equations are given below. Decide if they are correctly balanced or not. (T for True and F for False)

(I) MxOy + yC → x M + y CO

(II) 2Al2O3 + 3C → 4Al + 3CO2

(III) FeO + SiO2 → FeSiO3

(IV) Cu2S + 2Cu2O → 6Cu + SO2
(a) TTFT
(b) TTTT
(c) TFTF
(d) TTTF
Answer:

Option (b)

68.
Given that : ΔfGºCuO = -129.7 KJ mole-1, ΔfGºH2O = -237.2 KJ mole-1 and ΔfGºCO = -137.2 KJ mole-1

Which is the best reducing agent for CuO ?

(a) Hydrogen
(b) Carbon monoxide
(c) Coke
(d) All of the above
Answer:

Option (a)

69.
Part-I contains the names of minerals and Part-II contains the corresponding metals present in them.

Match Part-I with Part-II selecting correct options.

Part-I

(Minerals)

Part-II

(Metals)

(1)  Haematite

 (a)  Zn

(2)  Bauxite

 (b)  Fe

(3)  Siderite

 (c)  Mg

(4)  Calamine

 (d)  Al

(5)  Malachite

 (e) Cu

(6)  Magnetite

 (f)  Ca
(a) (1) → (a), (2) → (b), (3) → (c), (4) → (e), (5) → (f), (6) → (d)
(b) (1) → (b), (2) → (d), (3) → (b), (4) → (f), (5) → (e), (6) → (c)
(c) (1) → (b), (2) → (d), (3) → (b), (4) → (e), (5) → (c), (6) → (c)
(d) (1) → (b), (2) → (d), (3) → (b), (4) → (a), (5) → (e), (6) → (b)
Answer:

Option (d)

70.
What is the percentage of Al by weight in the earth's crust ?
(a) 6.3%
(b) 7.3%
(c) 8.3%
(d) 5.3%
Answer:

Option (c)

Showing 61 to 70 out of 154 Questions
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