Check Solved CBSE Sample Paper 2019 for upcoming Class 12 Chemistry board exam along with its Marking Scheme. CBSE itself publishes this Sample Paper for students preparing for board exams. This sample paper will give you an idea about changes in the latest examination pattern. It is based on the most recent CBSE Syllabus 2018-19.
The syllabus of the CBSE Class 12 Chemistry is vast and divided into physical chemistry, organic chemistry and inorganic chemistry. Therefore, selective study plays a vital role while preparing for Class 12 Chemistry Board Exam. It has been observed that questions based on topics given in CBSE Sample Paper are frequently asked in the board exams.
Students preparing for CBSE Board Exam 2019 should study this paper thoroughly and pen down all the topics from which questions have been picked in this paper. Afterwards, they should explore all the topics form NCERT Textbooks for better preparation.
• Time Allowed: 3 Hours
• Maximum Marks: 70
(a) All questions are compulsory.
(b) Section A: Q.no. 1 to 5 are very short answer questions and carry 1 mark each.
(c) Section B: Q.no. 6 to 12 are short answer questions and carry 2 marks each.
(d) Section C: Q.no. 13 to 24 are also short answer questions and carry 3 marks each.
(e) Section D: Q.no. 25 to 27 are long answer questions and carry 5 marks each.
(f) There is no overall choice. However an internal choice has been provided in two questions of one mark, two questions of two marks, four questions of three marks and all the three questions of five marks weightage. You have to attempt only one of the choices in such questions.
(g) Use of log tables if necessary, use of calculators is not allowed.
Question1. ZnO crystal on heating acquires the formula Zn1 + x O. Give reason.
On heating ZnO, it loses oxygen and there is excess of Zn2+ ions in the crystal.
Question1. There is an increase in conductivity when Silicon is doped with Phosphorous. Give reason.
When silicon is doped with phosphorous (group 15 element), the increase in conductivity is due to the delocalised negatively charged electrons.
Question2. Based on the type of dispersed phase, what type of colloids are micelles?
Question3. On the basis of crystal field theory, write the electronic configuration of d6 in terms of t2g and eg in an octahedral field when Δo < P.
Low spin configuration are rarely observed in tetrahedral coordination entity formation. Explain
The orbital splitting energies, Δt are not sufficiently large for forcing pairing of electrons in the tetrahedral coordination entity formation.
Identify the compound that on hydrogenation produces an optically active compound from the following compounds:
Write the name of the biodegradable polymer used in orthopaedic devices.
Poly β– hydroxybutyrate – co – β – hydroxyl valerate.