CBSE Class 12 Chemistry - Surface Chemistry VBQs

Scroll down for PDF

CBSE Class 12 Chemistry - Surface Chemistry VBQs Based on CBSE and NCERT guidelines. Value based questions are now being given in exams to promote morals and values in students, Students should read and understand the following VBQs to get better understanding and score good marks in exams

Chapter-5:SURFACE CHEMISTRY

Q1) Kala-azar is a disease caused by mosquito (protozoa) that results in irregular fever enlargement of spleen and hemorrhages that are generally fatal.

(1) What is the treatment of Kala-azar?

(2) Is colloidal antimony, lyophilic or lyophobic colloid?

(3) Is colloidal antimony, multimolecular, macromolecular or associated colloid? 

(4) How can we prevent us from fever caused by mosquito?

Ans.(i) colloidal antimony.

(iii) it is lyophobic colloid.

(iii) it is multimolecular colloid.

(iv) we should use mosquito repellant and do not allow stagnant water in coolers, overhead tanks, etc.

Q2) Surface chemistry deals with phenomenon that occurs at all the surface or interfaces. Many important phenomenon- corrosion, electrode process, heterogeneous catalysis, dissociation,adsorption,crystallisation occur at the interfaces.

(1) Why do we use charcoal, in gas marks, in coal mines?

(2) How is animal charcoal, used in the decolourisation of sugar?

(3) What is the use of silica gel which is given along with camera and other electronic equipments?

(4) There is safety lamp in coal mines. What is its purpose?

Ans. (i) it absorbs poisnous gases to large extent and not oxygen which is used for breathing.

(ii) it absorbs the undesirable colours from aqueous solution of sugar, we get colourless sugar.

(iii) silica gel absorbs water molecules on it surface which may spoil the equipment.

(iv) whenever there is excess of carbon monoxide gas, the colour of flame becomes blue and coal mine workers are asked to come out because carbon monoxide gas may lead to death. 

Please refer to the link below for CBSE Class 12 Chemistry - Surface Chemistry VBQs

Tags: 


Click on the text For more study material for Chemistry please click here - Chemistry

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

JEE in Punjabi too after English, Hindi and Gujarati

Punjab Minister Tript Rajinder Singh Bajwa requested the joint technology entrance exam (main) to be conducted in Punjabi and other regional languages too. In his letter to Union HRD Minister Ramesh Pokhriyal Nishank, the Punjab Minister for Higher Education and...

TIPS: Study habits for success

Being a student is fairly a difficult job. Alongside maintaining your curricular as well as extra-curricular activities adds more to it. Performance in academics is one of the major concerns. Every parent now tries to get their children more indulged in studies. Need...

CBSE DATE SHEET 2020

Central Board of Secondary Education, CBSE is to conduct the 10th and 12th Board Examination 2020 from February 15, 2020. Due to University Admissions, CBSE has shifted Board Exams dates from 1 March to February 15 from 2019. This year too CBSE would be making changes...

CBSE Circular Aryabhatta Ganit Challenge

For students with a keen interest in mathematics are now provided with a better opportunity to explore their knowledge. CBSE has announced to conduct an exam for the purpose of generating interest in maths among students. It is a trial to clarify the myth that...

CBSE Board Secretary says Class 10 and 12 CBSE Exam Pattern to be modified

The Central Board of Secondary Education is expected to introduce a few changes to the exam pattern for class 10 and board exams by 2023. Anurag Tripathi, secretary of CBSE speaking at an Assoham School Education Summit said that although this year class 10 students...

Requirements for admissions in CBSE affiliated Schools

CBSE gives an advanced form of education. They try to indulge students in interactions and teach application based subjects along with some others. Due to this preponderance of parents, they tend to admit their children in CBSE affiliated schools. General conditions...

×
Studies Today