CBSE Class 11 Chemistry solved practice paper is available for download in PDF format. This paper is based on latest CBSE syllabus and important for CBSE Class 11Chemistry final exam 2017. Students can download the complete paper from the link available at the end of this article.
About this CBSE Class 11 Chemistry Solved Practice Paper
The syllabus of CBSE Class 11 Chemistry is huge. But, there are some important concepts which are frequently asked in CBSE Class 11 Chemistry exams. This practice paper is based on such important concepts. All the questions of this paper are important for coming CBSE Class 11th Chemistry final exam 2017.
Inside CBSE Class 11 Chemistry Solved Practice Paper:
- In this practice paper there are 26 questions totalling to 70 marks.
- Question no. 1 to 5 are one mark questions
- Question no. 6 to 10 are two marks questions
- Question no. 11 to 22 are two marks questions
- Question no. 23 is marks question (value based question)
- Question no. 24 to 26 are five marks questions
The time duration to finish this paper is of 3 hours. There are no choices in any of the questions.
The detailed solution of each and every question is available in this paper.
Some questions from the solved question paper
Q: In the modern periodic table, what is indicated by the values of the period?
In the modern periodic table, each period begins with the filling of a new shell. Therefore, the period indicates the value of principal quantum number.
Q: Calculate the ratio of average kinetic energy of oxygen molecules to that of ozone molecules at 27 oC?
Average kinetic energy of any gas depends only on temperature and not upon the nature of the gas. Hence, both the gases will have same average kinetic energy at 27oC, i.e., the ratio will be 1:1.
Q: Explain how predicting the spontaneity of a reaction, free energy criteria is better than the entropy criteria?
Criteria of free energy charge is better because it requires free energy change f the system only whereas the entropy change requires the total entropy change of the system and the surroundings.
Q: With reason explain if the of water be same at and .
of water will not be same at 4o C and 25o C. This is because with increase in temperature, dissociation of molecules increases. Hence, [H+] will increase, i.e., at will be more than at
Q. What is dry ice and why is it so called?
Solid CO2 is known as dry ice. It sublimes directly and does not wet the surface like an ordinary ice. Therefore, it is called dry ice.
Q. Explain the effect of increasing temperature of a liquid, on intermolecular forces operating between its particles. What will happen to the viscosity of a liquid it its temperature is increased?
If temperature of liquid is increased than the kinetic energy of the molecules will also increase due to which it can overcome the intermolecular forces of attraction and hence the liquid can flow more easily.
Q. Explain why cations are smaller and anions are larger in radii than their parent atoms?
Ionic radius of cation is always smaller than the parent atom because the loss of one or more electrons increases the effective nuclear charge. As a result the force of attraction of nucleus for the electrons increases and hence the ionic radii decreases.
In contrast, the ionic radius of an anion is always larger than its parent atom because the addition of one or more electron decreases the effective nuclear charge.
The force of attraction of the nucleus for the electrons decreases and hence the ionic radii increases.