JEE Chemistry Important Q/As (JEE Mains Exam 2021)

JEE Mains Chemistry 2021 Important Q/As

Brief: IIT JEE Mains 2021Session – 4 exam dates are finally announced! Dear JEE Mains aspirants, buckle up for your exams. This article can help you with useful links, tricks, tips, important points to remember, and important questions for JEE Mains Session – 4. Go through these JEE chemistry important Q/As (Questions with Answers) without fail and rock your exams…!

Get started now!


Introduction: IIT JEE Mains & Advanced

In India, after 12th, for those students who want to pursue Engineering through a renowned Institute, there is no better option other than IITs. In fact, with increasing technology and online teaching in today’s world, students begin preparing for JEE from 11th grade itself. JEE Mains + Advanced exams are conducted by the National Testing Agency (NTA) wherein the council of experts sit and draw out an exam paper that will be the key to their dreams for most of the students.

JEE is recognized as one of the toughest exams in the whole world. You can easily find and watch the honorable & most famous physics professor Dr. Walter Levin reviewing an exam paper on his YouTube channel.

Nowadays, being able to crack JEE has become a social reputation symbol in society which is pathetic. The exam is specifically made tough so that only the focused, determined, and true-deserving candidates get a chance to pursue their dreams in the best-in-class IIT institutes.

JEE Mains Exam 2021

In 2021, the JEE Mains third and fourth sessions were scheduled for April and May. But, it got postponed due to the second wave of the COVID crisis. In July 2021, session – 3 was conducted. Recently, NTA had announced the results for session – 3.

Click here for results!

A couple of weeks ago, the fresh dates for the fourth session (postponed May Session) were also announced. Download the official notification/ notice here. What more? Start your revisions with no further delay… Don’t miss to go through the below given JEE Chemistry important Q/As which could be of great use to you!

Due to COVID, the NTA has also increased the number of exam cities for the upcoming session – 4.

The latest news on JEE Mains 2021 Session – 4 

JEE Main Session 4 examination is going to commence on August 26th, 27th, 31st, September 1st, and September 2nd. This official notification was obtained via a press meet hosted by the central education minister Mr. Dharmendra Pradhan. 

He said that JEE Mains Session – 4 has been redesigned in light of the students’ (JEE aspirants) demand for conducting the exams and the COVID pandemic. As the exams have been delayed due the unforeseen and uncontrollable circumstances, NTA shall extend their help and support to students like you to give away their best performance in the exams. As of now, almost 7.32 lakh students have already been enrolled for the upcoming JEE Mains Exam.

You may also read IIT JEE Advanced 2021 Exam: Latest News and Exam tips.

JEE Mains 2021 – JEE Chemistry Syllabus

Let us have a look at the syllabus, no. of questions to be asked from each topic, time to be allotted, topic-wise weightage, etc.

TopicsTime allocation for revisionWeightage in %No. of questions asked
Transition Elements and Coordination Chemistry6 hours123
Periodic table and Representative Elements6 hours123
Thermodynamics And Gaseous State4 hours82
Atomic Structure4 hours82
Chemical Bonding4 hours82
Chemical And Ionic Equilibrium4 hours82
Solid-State And Surface Chemistry4 hours82
Nuclear Chemistry And Environment4 hours82
Mole Concept2 hours41
Redox Reaction2 hours41
Electrochemistry2 hours41
Chemical Kinetics2 hours41
Solution and Colligative Properties2 hours41
General Organic Chemistry2 hours41
Stereochemistry2 hours41
Hydrocarbon2 hours41
Alkyl Halides2 hours41
Carboxylic Acid and their Derivatives2 hours41
Carbohydrates, amino acid, and Polymers2 hours41
Aromatic Compounds2 hours41
TOTAL60 hours120


For a detailed syllabus read JEE Mains Exam Pattern 2020- Pattern and marking scheme.


Important points for JEE Mains exam 2021 

  1. Strategically plan the important things that you must study like books, PDFs, etc. 
  2. Solving 40-50 questions daily will not just help you in easing exam fear. But,  let you be confident about your preparation and test your memorization skill as well.
  3. Rather than reading all bulky material, try having your summary notes, voice notes and keep revising them regularly.
  4. Try to guess answers with approximation because the chemistry portion is all about planning your time and investing it wisely.
  5. Practice previous year mocks and questions frequently. Of course, this will make you familiar with the frequently asked questions and make you lucky if some of those get repeated.
  6. Chemistry is that portion of JEE Mains that is mostly fact-based and students must try attempting that first. Solving chemistry questions first will give you a lot more time in physics and mathematics.
  7. Start with organic chemistry if you are clear with concepts. 
  8. Try allocating a max of 8 minutes in inorganic chemistry, 12 minutes in Organic Chemistry, 15 minutes in physical chemistry, and the remaining time for value-based questions.
  9. Last but not least: Be consistent with your revisions (This piece of JEE Chemistry important Q/As can help you with important question types)

JEE Chemistry Important Q/As
(Questions with Answers)

Q1. Identify the one that is used for the preparation of colloids?

  1. Ostwald Process                                          
  2. Bredig’s Arc Method
  3. Arkel Method
  4. Mond Process Van

Ans. [B]

Bredig’s Arc method is one of the methods that is used to form metal colloids.


Q2.  A sealed container has an open beaker of water which is in equilibrium with water vapor. When we add a few grams of glucose to the beaker of water, the rate at which water molecules leaves the

  1. solution increases
  2. vapor increases
  3. solution decreases
  4. vapor decreases

Ans. [B] 

When we add a solute to a solvent, the surface area for vaporization decreases causes a lowering in vapor pressure. 

Q3. For devising photoelectric cells, we use the metal:

  1. Cs 
  2. Li
  3. Rb
  4. Na

Ans. [A]

Cs is used in a photoelectric cell because we know that it has the least ionization energy.


Q4. Name the property that shows an opposite trend in comparison to other properties across a period

  1. Electronegativity
  2. Electron gain enthalpy
  3. Atomic radius
  4. Ionization enthalpy

Ans. [C]

In general, in the case of atomic radius decreases while ionization enthalpy, electron gain enthalpy, and electronegativity increase when effective nuclear charge increases.


Q5. Identify the correct statement with respect to dinitrogen is?

  1. N2 is paramagnetic in nature
  2. Liquid dinitrogen is not used in cryosurgery.
  3. Capable of combining with dioxygen (@ 250 deg C)
  4. It can be used as an inert diluent for reactive chemicals.

Ans. [D]

  1. N2 is diamagnetic, with no unpaired electrons.
  2. Liquid nitrogen is used as a refrigerant to preserve food items and used in cryosurgery.
  3. In the iron and chemical Industry inert diluents for reactive chemicals.
  4. N2 does not combine with O and H.
  5. Nitrogen will combine with oxygen, however; in the presence of lightning or a spark.


 Q6. Which is Kraft temperature in the given options

  1. Above which the aqueous solution of detergents starts boiling
  2. Below which the aqueous solution of detergents starts freezing.
  3. Above which the formation of micelles takes place.
  4. Below which the formation of micelles takes place.

Ans. [C]

TK+ temperature above which formation of micelles takes place.


Books you may refer for JEE Mains Exam 2021 

  1. NCERT books (11th and 12th grade)
  2. Organic Chemistry by M.S. Chauhan
  3. Inorganic Chemistry by O.P.Tandon
  4. Concept of Physical Chemistry by P. Bahadur
  5. R.C Mukherjee’s Modern Approach to Chemical Calculations 
  6. Physical Chemistry by N. Awasthi
  7. P.W.Atkin’s Physical Chemistry

You may also read Quick hacks to prepare chemistry for JEE Mains.

Here is all about JEE 2021 exam, curriculum, and FREE demo class! Check out now >>> 

Are you revising for IIT JEE 2021 by now? Get the secret tips to score 99 percentile from our expert tutors!

Chemistry Bench’s Special Tutoring for IIT JEE Mains Exam 2021

Chemistry bench is an online tutoring platform that aims at helping students score higher in distinct competitive exams such as NEET, JEE, SAT, IB, etc. Make use of their FREE DEMO CLASSES before you close this tab! 

We hope this blog covering JEE Chemistry important Q/As has helped you better understand the JEE Mains exam 2021 exam and has covered most of your queries for JEE Chemistry 2021 Session 4. If you have any other query feel free to reach out to us! ( Visit Chemistry Bench)

For NEET important Q/As, please visit this page.

Best Wishes,
Team Chemistry Bench

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