12th Standard CBSE Syllabus & Materials

12th Standard CBSE

CBSE 12th Economics Government Budget and the Economy Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Interface Python with MySQL - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Database Concept - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Data Communication - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Data Structures - New Previous year Question Papers Study Material - QB365 Set A

NEW

12th Standard CBSE

CBSE 12th Computer Science Functions - New Previous year Question Papers Study Material - QB365 Set A

CBSE 12th Standard Chemistry Subject General Principles and Processes of Isolation of Elements Ncert Exemplar 1 Mark Questions 2021

Published on: 25/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

Questions + Answers key

Take MCQ Chemistry Test

QB365 Student Learing Managemnet System

Std: 12th Standard CBSE - Chemistry

chapter: - NCERT Exemplers

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

1 Marks

5 x 1 = 5

what is the composition of copper matte?

What is the role of a stabilizer in the froth floatation process?

(a) Why is it that only sulphide ores are concentrated by froth floatation process?
(b) Which of the following ores can be concentrated by froth floatation method and Why?

Name a sulphide ore of copper

How is copper extracted from a low grade ore of it?

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

1 Marks

5 x 1 = 5

()
Copper matte chiefly consists of Cu₂S along with some unchanged FeS

()
Chemical compounds like cresols and aniline which tend to stabilize the froth are called froth stabilizers.

()
(a) This is because the sulphide ore particles are preferentially wetted by oil and gangue particles are preferentially wetted by water.
(b) Froth floatation is the process employed for the extraction of metals from their sulphide ores like ZnS.

()
Copper pyrites,CuFeS₂

()
Extraction of Copper from low-grade ores and scraps: It is extracted by hydrometallurgy. It is carried out in two steps:
(a) Leaching: Low-grade copper ores and scraps are leached by using acid or bacteria.
(b) Reduction: The solution containing copper ions is treated with H₂.
\({ Cu }^{ 2+ }(aq)+{ H }_{ 2 }(g)\rightarrow Cu(s)+2{ H }^{ + }(aq)\)