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Processes of Isolation of Elements · Chemistry · NEET
MCQ (Single Correct Answer)
1
Match List - I with List - II
| List - I (Mixtures/Sample) |
List - II (Technique used for purification) |
||
|---|---|---|---|
| (A) | Glycerol from spent lye | (I) | Steam distillation |
| (B) | Chloroform + Aniline | (II) | Fractional distillation |
| (C) | Fractions of crude oil | (III) | Distillation under reduced pressure |
| (D) | Aniline + Water | (IV) | Distillation |
Choose the correct answer from the options given below :
NEET 2023 Manipur
2
Read the following statements and choose the set of correct statements :
(A) Chrome steel is used for cutting tools and crushing machines.
(B) The fine dust of aluminium is used in paints and lacquers.
(C) Copper is used for reduction of alcohol
(D) Zinc dust is used as a reducing agent in the manufacture of paints
(E) Iron is used for galvanising zinc
Choose the most appropriate answer from the options given below :
NEET 2023 Manipur
3
The reaction that does NOT take place in blast furnace between 900 K to 1500 K temperature range during extraction of iron is :
NEET 2023
4
Match List - I with List - II.
| List - I (Ores) |
List - II (Composition) |
||
|---|---|---|---|
| (a) | Haematite | (i) | Fe$$_3$$O$$_4$$ |
| (b) | Magnetite | (ii) | ZnCO$$_3$$ |
| (c) | Calamine | (iii) | Fe$$_2$$O$$_3$$ |
| (d) | Kaolinite | (iv) | [Al$$_2$$(OH)$$_4$$Si$$_2$$O$$_5$$] |
Choose the correct answer from the options given below:
NEET 2022 Phase 1
5
The maximum temperature that can be achieved in blast furnace is :
NEET 2021
6
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
NEET 2021
7
Identify the correct statement from the following :
NEET 2020 Phase 1
8
Which one is malachite from the following?
NEET 2019
9
Considering Ellingham diagram, which of the
following metals can be used to reduce
alumina?
NEET 2018
10
Extraction of gold and silver involves leaching with CN$$-$$ ion. Silver is later recovered by
NEET 2017
11
Match items of Column I with the items of Column II and assign the correct code :
| Column $${\rm I}$$ | Column $${\rm I}$$$${\rm I}$$ | |||
|---|---|---|---|---|
| (A) | Cyanide process | (i) | Ultrapure Ge | |
| (B) | Froth floatation process | (ii) | Dressing of ZnS | |
| (C) | Electrolytic reduction | (iii) | Extraction of Al | |
| (D) | Zone refining | (iv) | Extraction of Au | |
| (v) | Purification of Ni | |||
NEET 2016 Phase 1
12
In the extraction of copper from its sulphide ore. the metal is finally obtained by the reduction of cuprous oxide with
AIPMT 2015
13
''Metals are usually not found as nitrates in their ores.'' Out of the following two (I and II) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
AIPMT 2015 Cancelled Paper
14
The metal oxide which cannot be reduced to metal by carbon is
NEET 2013 (Karnataka)
15
Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is
NEET 2013
16
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with
AIPMT 2012 Prelims
17
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of
AIPMT 2012 Prelims
18
Which one of the following is a mineral of iron?
AIPMT 2012 Prelims
19
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
AIPMT 2011 Mains
20
Which of the following elements is present as the impurity to the maximum extent in the pig iron?
AIPMT 2011 Prelims
21
Which of the following pairs of metals is purified by van-Arkel method?
AIPMT 2011 Prelims
22
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
AIPMT 2007
23
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
AIPMT 2007
24
The method of zone refining of metals is based on the principle of
AIPMT 2003