Rajasthan Board Class 12 Chemistry Solved Question Paper 2016

In this article, we are providing the Rajasthan Board Class 12 Chemistry Question Paper 2016 along with its solutions. All the solutions have been explained in a way to help students easily understand the concepts used thus making an effective preparation for the exam.

Key features of Rajasthan Board Class 12 Chemistry Solved Question Paper 2016 are

• Simple and stepwise solutions are provided for each question
• Appropriate concepts have been used in solutions
• Chemical equations are written correctly

Rajasthan Board Class 12 Chemistry Question Paper and its solutions have been collated in the form of PDF which students may download to for free of cost and practice it while preparing for the upcoming RBSE Board Exam 2019.

Structure of Rajasthan Board Class 12 Chemistry Paper 2016 is as per the following table:

Question number 21, 27, 28, 29 and 30 have internal choices.

A few sample questions and their solutions are given below:

Q. What happens when a raw mango placed in concentrated salt solution?

Ans.

When a raw mango is placed in concentrated salt solution, it loses water due to osmosis. Water flows from solution of lower concentration to higher concentration causing raw mango to shrink.

Q. Write definition of homo polymer and co-polymer?

Ans.

Homo polymers: The addition polymers formed by the polymerization of single monomeric species are known as homo polymers. For example: Natural rubber, Nylon-6.

Copolymers: The addition polymers formed by the polymerization of two different monomers are termed as copolymers. For example: Buna-N, Buna-S, Nylon-66.

Rajasthan Board Class 12 Chemistry Solved Question Paper 2017

Q. Explain copper is refined with electrolytic method? Explain with necessary reaction?

Ans.

In electrolytic refining of copper, anode is made of impure copper and cathode is made of pure copper strips. An acidified solution of copper sulfate is taken as electrolyte. The net result of electrolysis is the transfer of copper in pure form from the anode to the cathode.

Anode: Cu ® Cu²⁺ + 2e^–   

Cathode: Cu²⁺ + 2e^– ® Cu 

Q. Explain the violet colour of [Ti(H₂O)₆]³⁺ complex on basis of the crystal field theory ?

Ans.

In ground state,Titanium has 23 electrons with outer shell electronic configuration 3d³ 4s². In the [Ti(H₂O)₆]³⁺ complex it is observed that titanium is in its +3 oxidation state. Here, single electron in the metal d orbital is in t_2g level in the ground state of the complex. The next higher state available for the electron is the empty e_g level. If light corresponding to the energy of yellow-green region is absorbed by the complex, the electron will excite from t_2g level to e_g level. Consequently, the complex appears to be violet.

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The previous years' board question papers give an idea about the important concepts and topics to be prepared with more attention. After solving the previous years’ question papers, students get to know about the pattern, difficulty level of the questions and important topics tested in the board exams.

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