CBSE Class 12 Chemistry General Principles And Processes Of Isolation Of Elements Worksheet Set A

CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers. 

ONE MARK QUESTIONS

1.Out of C and CO, which is a better reducing agent at 673 K? (2013)

TWO MARK QUESTIONS

1.Describe the role of

a) Iodine in the refining of titanium. (2010)

b) Collector in the froth floatation process. (2012)

2.Describe how the following changes are brought out:

a) Pig iron into steel

b) Zinc oxide into zinc metal. (2010)

THREE MARK QUESTIONS

1.Differentiate between

a) Calcination and roasting

b) Electrolytic reduction and electrolytic refining

c) Flux and slag

2.Write the chemical reactions which take place in the following operations:

a) Electrolytic reduction of Al2O3.

b) Isolation of Zn from zinc blende.

c) Mond’s process for refining of Ni.

3.Give reasons:

a) Copper matte is put in silica lined convertor.

b) Cryolite is added to alumina during electrolytic reduction.

c) Pine oil is used in the froth floatation process

4.a) Name the method used for the refining of titanium. b) What is the role of Zn in the extraction of silver? c) Reduction of metal oxide to metal becomes easier if the metalobtained is in liquid state. Why?(2015)

VALUE BASED QUESTION

1.Sam owns sites from where copper with other metals are mined. At sites he found the low grade copper ores are available with zinc and iron scraps.

a) Which of the two scraps should Sam use for the reduction of leached copper and why?

b) Mention the value in Sam’s choice.

c) What do you mean by blister copper?

d) Why is extraction of copper from copper pyrite more difficult than that from its oxide ore through reduction?

Please click the link below to download full pdf file for CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements.

Tags: 

 


Click to View or Download pdf file
Click for more Chemistry Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Procedure for correction in Name and Date of Birth

Procedure for correction in Name and Date of Birth in CBSE records Name Change: Applications regarding changes in name or surname of candidates will be considered provided the changes have been admitted by the Court of law and notified in the Government Gazette before...

Board Exams Class 10 and 12 Notification by CBSE

Because of the prevailing condition of spread of COVID-19 pandemic in the country, special efforts are required for conducting examinations in a safe manner. As a number of students have shifted from the district of their school to some other district in the country,...

TV Channels for Students by CBSE

In enhancing the students studying part, the Government is planning to introduce one standard one channel plan. The lockdown in India has adversely collapsed all the operations including schools, colleges, and workplaces with unanticipated setbacks. On behalf of the...

Art Integrated Project work for classes 1 to 10

CBSE Board has decided to introduce Art-Integrated Project work for classes I to X to promote Art-Integrated Learning in schools to make teaching learning Competency-Based and joyful. As part of this, at least one Art-Integrated Project in each subject shall be taken...

CBSE advisory on student marks

CBSE has issued a public advisory for all students to be careful from unscrupulous persons impersonating themselves as officers/officials of CBSE. These people have been contacting parents and have been telling them that they have access to student marks data for Board...

Cogito and The Question Book A series on Thinking skills by CBSE

The Board has dedicated this academic session 2020-21 for ‘Competency Based Learning’. Skills connected to Critical & Creative thinking, Problem Solving, Collaboration and Communication are core to successful living in the 21st Century. To focus on the importance...

×
Studies Today