JEE Chemistry Topics: States of Matter

JEE Chemistry Topics: States of Matter

States of Matter is an important topic of JEE chemistry. Questions from this topic are highly probable in JEE. Read on for recommended books and tips for each state.

Solid State

Solid state is the easiest topic of JEE Chemistry if understood properly. This topic does not require your whole day to learn or by heart it, it hardly requires 1-2 hours of your day for understanding. Also, questions that are asked in JEE Mains or Advanced from Solid State are not at all difficult, you only have to change your way of thinking in this chapter, visualize things/models in 3-dimension and you are done. I am sharing the best way through which you can master this chapter. The best way is using your ‘Imagination power’.

Important Books and Sources

Follow NCERT Chemistry properly or ‘Pradeep’s New Course Chemistry’ if you want to go into deep detail, this chapter is explained properly in it. Read the chapter thoroughly, try to visualize and imagine structures & shapes. You may have some problem at first in understanding or visualizing the 3-D shapes. So, you are advised to refer to the videos & photos from the internet.

Once you have understood the concepts of this chapter, do all (Exercise questions as well as Intext Questions) the questions given in NCERT. This will be more than enough from JEE Perspective. 1 to 2 question will be asked from this topic in JEE Mains & Advanced, so do not leave this chapter, at least study once as it can fetch you easy marks.

Some Important Tips

  • Taking a visual and Imaginative approach:
    When in a room, you must imagine yourself sitting in a cube or a unit cell which has 6 faces, 8 corners, and 1 center of the cube or unit cell. Now,
    • At each corner of the room lies an atom which is shared by 7 other similar room. These atoms contribute 1/8th of their total size. At the center of your room lies one body-centered atom, which contributes its whole size.
    • Similarly, at the center of each wall, atoms present will contribute 1/2 of its total size. And the atom which will lie on the edge of the wall will contribute 1/4th of its total size. (Notice carefully that there will be a total of 12 edges in a cube.)

      By this way, you can calculate the Total number of atoms in a unit cell, Type of unit cell whether Simple Cubic, Body-Centered or Face Centered and also the distance between required atoms.

  • Questions may be asked from different topics like close packing of spheres, voids & radius ratio, point and line defects in solids, calculation of no. of atoms, and location of nearest neighbor atoms.
  • Study Packing Fraction & Efficiency of Cubic and Hexagonal unit cells very properly. Short questions can also be asked from concepts like the difference between amorphous and crystalline solids. Always look out for visual approach, rather than simply learning as that stays in your mind for long.

Liquid State

Not a separate chapter for JEE Chemistry but questions may be asked based on this topic. Sometimes questions from other chapters may come mixed with concepts from it. Most of the required topics will be covered in Calorimetry and Surface Tension of Physics.

  • Just go through the topics like Latent heat of Vaporization and Fusion, Phase diagrams, Surface Tension, Triple point and cycles of water etc.
  • Simple calculations based on Latent & Specific heat of Fusion and Vaporization are asked, it may include conversion of solids, liquids or gases from one form to another form.

Gaseous State

Before starting Gaseous State, you need to go through Kinetic Theory of Gases (KTG). KTG is an important topic as it forms the base of Gaseous State. Besides this, concepts of KTG is also required in understanding basics of Heat & Thermodynamics hence, becomes important.

Now coming to Gaseous State, it is very important as far as JEE is concerned. Around 2-3 questions will be asked in both JEE Mains as well as JEE Advanced from this chapter. And the best thing about this chapter is that questions would be easy and direct formula based. But still, most of the students find it tricky because either they do not learn formulas properly or do calculation mistakes.

Important Books

Follow standard books like NCERT and Physical Chemistry by P. Bahadur (Best book for physical chemistry, has a large number of solved examples and wide variety of numericals to make your concepts strong)

Revise all the formulas of Gaseous State as well as KTG 2 to 3 times. Solve all the questions given in your Board Text Book NCERT with proper concentration and try to do all the calculations by yourself without using a calculator. Then move on to P. Bahadur.

Some Basic Tips

  1. Practice lots of problem from Boyle’s Law, Charle’s Law, Gay-Lussac’s Law and Avogadro’s Law from your Board Text Book to build a strong approach for the chapter.
  2. Questions on topics like Ideal gas equations, Graham’s Law of Diffusion, Dalton’s law of partial pressure and comparison between Average, Mean & Root Mean Square Velocities of the ideal gas are frequently asked in JEE Paper. So, build a strong concept on these topics.
  3. You must pay extra attention to Van der Waal’s Equation for Real Gases, i.e. the Deviation from Ideal behavior, and Causes of Deviation from Ideal Behaviour etc. Different forms of Van der Waal’s equation at very low & very high Pressure as well as at very Low & very High Temperature. These equations are asked directly in JEE Mains MCQ so, be thorough with them.
  4. For numerical questions, you must learn shortcut formulae to cut short your calculations to enable you to reach the answer quickly. If you face difficulty in remembering the particular formulae, do have a look at its logic or derivation so that you can derive it on your own when needed.

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