CBSE Class 12 Chemistry Marking Scheme & Sample Paper: 2019
Download latest CBSE Marking Scheme and Sample Paper for the preparation of CBSE Class 12 Chemistry Board Exam 2019. With the help of CBSE Class 12 Chemistry Marking Scheme 2019, students can easily understand the proper way of writing answers in the board exam. CBSE has recently released Marking Scheme along with Sample Papers. The complete Marking Scheme of CBSE Class 12 Chemistry is explained with the help of a Sample Paper.
Some questions from CBSE Class 12 Chemistry Marking Scheme and Sample Paper 2019:
Q1. 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.
Q1. 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.
Q2. Based on the type of dispersed phase, what type of colloids are micelles?
Q3. 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.