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31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - NEET MCQ


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11 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT)

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) below.
Solutions of 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) questions in English are available as part of our Chemistry Class 12 for NEET & 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) solutions in Hindi for Chemistry Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) | 11 questions in 20 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 1

Method used for obtaining highly pure silicon used as a semiconductor material, is [1994, 96]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 1

Si obtained by reduction of SiCl4 with H2 is further purified by zone refining method to get Si of very high purity. Silicon is purified by zone-refining process because the impurities present in it are more soluble in the liquid phase than in the solid phase.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 2

The method of zone refining of metals is based on the principle of [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 2

Zone refining is based on the difference in solubility of impurities in molten and solid state of the metal. This method is used for obtaining metals of very high purity.

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31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 3

Which of the following statements, about the advantage of roasting of sulphideore before reduction is not true? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 3

The sulphide ore is roasted to oxide before reduction because the ΔGof of most of the sulphides are greater than those of CS2 and H2S, therefore neither C nor H can reduce metal sulphide to metal. Further, the standard free energies of formation of oxide are much less than those of SO2. Hence oxidation of metal sulphides to metal oxide is thermodynamically favourable.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 4

Sulphide ores of metals are usually concentrated by froth flotation process. Which one of the following sulphide ores offer an exception and its concentrated by chemical leaching? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 4

Leaching is the selective dissolution of the desired mineral leaving behind the impurities in a suitable dissolving agent eg Argentitie or Silver glance, Ag2S is an ore of silver. Silver is extracted from argentite by the mac-Arthur and  Forest process (leaching process).

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 5

Which of the following elements is present as the impurity to the maximum extent in the pigiron ?[2011]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 5

Pigironor castiron contains 3 – 5% carbon and varying amounts of Mn, Si, P and S which makes the iron hard and brittle.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 6

Which of the following pairs of metals is purified by van Arkel method ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 6

Zr and Ti are purified by van Arkel method.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 7

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. [2011 M]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 7

In blast furnace at about 1270 K, calcium carbonate is almost completely decomposed to give CaO which acts as a flux and combines with SiO2 present as impurity (gangue) in the ore to form calcium silicate (fusible slag)

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 8

Which one of the following is a mineral of iron? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 8

[Fe3O4 ⇒ Magnetite]
[CuCO3 Cu(OH)2 – Malachite]
Pyrolusite – MnO2 Cassiterite – SnO2.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 9

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with : [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 9

Cuprous oxide formed during roasting of cuprous sulphide is mixed with few amount of cuprous sulphide and heated in a reverberatory furnace to get metallic copper.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 10

Identify the alloy containing a non-metal as a constituent in it. [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 10

Invar is a nickel iron alloy, Bell metal is an alloy of about 80% copper and 20% tin, Bronze is also an alloy of copper and tin.
Steel : It always have few % of carbon.

31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 11

The metal oxide which cannot be reduced to metal by carbon is [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: General Principles & Processes of Isolation of Elements (Old NCERT) - Question 11

Al2O3 cannot be reduced by carbon.

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