1

NEET 2021

MCQ (Single Correct Answer)
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
A
Zone refining
B
Electrolysis
C
Chromatography
D
Distillation

Explanation

Distillation method is generally used for the purification of metals having low boiling point such as Hg, Zn etc.
2

NEET 2021

MCQ (Single Correct Answer)
The maximum temperature that can be achieved in blast furnace is :
A
Upto 5000 K
B
Upto 1200 K
C
Upto 2200 K
D
Upto 1900 K

Explanation

A blast furnace is generally used for reduction of iron oxides but it can be used for extraction of other metals like Pb from PbO, etc.

In a blast furnace, hot air is blown from the bottom of furnace. This bottom surface has the maximum temperature of upto 2200 K.
3

NEET 2020 Phase 1

MCQ (Single Correct Answer)
Identify the correct statement from the following :
A
Blister copper has blistered appearance due to evolution of CO2
B
Vapour phase refining is carried out for Nickel by Van Arkel method.
C
Pig iron can be moulded into a variety of shapes.
D
Wrought iron is impure iron with 4% carbon.

Explanation

The iron obtained from blast furnace contains about 4% carbon and many impurities like S, P, Si, Mn in due to it's malleable nature they can smaller amount. This is known as pig iron and cast into variety of shapes.
4

NEET 2019

MCQ (Single Correct Answer)
Which one is malachite from the following?
A
Fe3O4
B
CuCO3.Cu(OH)2
C
CuFeS2
D
Cu(OH)2

Explanation

Malachite = CuCO3.Cu(OH)2

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